occurrence and uses of amphiboles

  • Amphibole mineral Britannica

    The term biopyribole has been used to describe any mineral that has both I beams and sheetlike structures. The name comes from biotite (mica), pyroxene, and amphibole. Biopyriboles have chain widths and repeat sequences like pyroxenes (single-chain repeats), amphiboles (double-chain repeats), and triple-chain repeats.

  • Amphibole Group Minerals Physical - Optical Properties ...

    The prismatic cleavage angle of amphiboles is about 56° and 124°, while the pyroxene cleavage angle is about 87° and 93°. Amphibole Origin and Occurrence. Exhibiting an extensive range of possible cation substitutions, amphiboles crystallize in both igneous and metamorphic rocks with a broad range of bulk chemical compositions.

    Author: Geology Science
  • Amphibole Minerals Education Coalition

    Amphibole. Amphibolite is a dark, heavy, metamorphic rock composed mostly of the mineral amphibole. Amphibolites have very little to no quartz. “Amphibole” refers not to a single mineral, but to a group of minerals. Most belong to the monoclinic crystal system, but some belong to

  • Occurrence and chemical composition of amphiboles and ...

    Amphiboles are found in the corundum-bearing rock, locally in association with extremely Al-poor orthopyroxene (Low-Al OPX). In this paper, petrological and geochemical studies revealed that amphiboles and Low-Al OPX in the studied samples were formed by infiltration of aqueous fluids in the late stage of exhumation of the Horoman Complex.

    Cited by: 7
  • University of Minnesota’s Mineral Pages: Amphibole

    Amphibole comes from the Greek word amfibolos, which means ‘ambiguous’ or ‘doubtful’. Ambiguity also surrounds the older name for part of the mineral group. Although it is no longer used as a mineral name, the most common rock-forming amphiboles were once called ‘Hornblende’.

    Description and Identifying CharacteristicsAn important group of rock-forming minerals in igneous and metamorphic rocks, amphiboles share a similar crystal structure and cleavage pattern, bu.. Our Earth: The Geologic Importance of AmphiboleOccurring in most intermediate and felsic igneous rocks, amphibole minerals often form as an alteration of pyroxene minerals during late, water-wet.. Our Society: The Economic Importance of AmphiboleMost of the common, rock-forming amphibole minerals have relatively little economic value on their own. Their sole economic contribution is being p.. Our Future: The Environmental Implications of Amphibole UseAlthough most asbestos comes from chrysolite, rather than amphiboles, the widespread past use of asbestos poses some serious health risks. The same...Amphibole in The Upper MidwestAmphibole is a common component of plutonic and metamorphic rocks across the region, but there are no notable local occurrences of collectable grad...
  • Amphibolite: Metamorphic Rock - Pictures, Definition More

    Uses of Amphibolite. Amphibolite has a variety of uses in the construction industry. It is harder than limestone and heavier than granite. These properties make it desirable for certain uses. Amphibolite is quarried and crushed for use as an aggregate in highway construction and as a

  • Mineralogical Society of America - Amphiboles

    Systematic and well-planned synthesis of amphiboles, combined with careful spectroscopy, has greatly furthered our understanding of cation and anion order in amphiboles. The use of bond-valence theory to predict patterns of SRO (Short-Range Order) in amphiboles, and use of these predictions to understand the infrared spectra of well ...

  • Amphibole - Wikipedia

    Amphibole (/ ˈ æ m f ɪ b oʊ l /) is an important group of inosilicate minerals, forming prism or needlelike crystals, composed of double chain SiO 4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their structures. Amphiboles can be green, black, colorless, white, yellow, blue, or brown. The International Mineralogical Association currently ...

  • Amphibole Supergroup: Mineral information, data and ...

    The name amphibole (Greek αμφιβολος - amphibolos meaning 'ambiguous') was used by René Just Haüy to include tremolite, actinolite, tourmaline, and hornblende. The group was so named by Haüy in allusion to the protean variety, in composition and appearance, assumed by its minerals. This term has since been applied to the whole group.

  • Pyroxene mineral Britannica

    Typically pyroxenes occur as stubby prismatic crystals. They are chemically analogous to the amphiboles except that, as discussed above, hydroxyls are absent in the pyroxene structure. They are similar in colour, lustre, and hardness to the amphiboles but have slightly higher densities owing to the absence of hydroxyls.

  • PUBLICATION FORUMBOOK REVIEWS - Elements

    ELEMENTS 212 JUNE 2008 PUBLICATION FORUMBOOK REVIEWS AMPHIBOLES: Crystal Chemistry, Occurrence, and Health Issues1 As noted in the preface, volume 9 of the Reviews in Mineralogy series, Amphiboles and Other Hydrous Pyriboles, published 25 years ago, seemed to contain all that was

  • Reported Historic Asbestos Mines, Historic Asbestos ...

    Ross, Malcolm, and Nolan, R.P., 2003, History of asbestos discovery and use and asbestos-related disease in context with the occurrence of asbestos within ophiolite complexes, in Dilek, Yildirim, and Newcomb, Sally, eds., Ophiolite concept and the evolution of geological thought: Geological Society of America Special Paper 373, p. 447-470.

  • Libby Amphibole Asbestos - Case Studies

    Libby, Montana, a small town nestled in the northwestern corner of the state, is a humble town, a great destination for anglers and hunters. What many people don't know about Libby, is the lurking danger hanging over the heads of the 3,000 or so Libby residents. Located nearby is an old vermiculite mine that has created a health hazard dealing with asbestos.

  • Amphibolite - Metamorphic Rocks

    Amphibolite is a common metamorphic rock. It is made of amphiboles (usually hornblende) and plagioclase. Most samples have a relatively simple composition: hornblende + plagioclase.Garnet (almandine), pyroxene, biotite, titanite, magnetite, epidote,

  • University of Minnesota’s Mineral Pages: Pyroxene

    Did you know... Jade ornaments and figurines fashioned by ancient Aztec and Mayan artisans are pyroxene’s most familiar face. An important rock-forming mineral of igneous and metamorphic rocks, pyroxene is not a specific mineral, but an informal name used for a number of group of related minerals.

  • Chapter 6.2 Asbestos - World Health Organization

    (d) transport and use of asbestos-containing products (e) disposal. There has been a steep rise in the production and use of asbestos in the last 100 years. Asbestos consumption has levelled off in recent years (1) to about 4 million tonnes (1983) and, because of the relative decline in crocidolite and amosite usage (1) the figure represents

  • Zircon Mineral Physical - Optical Properties, Occurrence ...

    It is a popular gemstone that has been used for almost 2000 years. It takes place in a huge range of colours and has a brightness and hearth that competitors those of diamond. Colorless zircon is now and again used as a lower-price opportunity for diamond. Zircon must no longer be harassed with cubic zirconia, that’s a man-made cloth.

  • Volume 41 December 2003 Part 6 - rockptx

    amphiboles occur in diverse geological settings, and (3) the use of chemical modifiers and species names were inconsistent prior to Leake et al. (1997), resulting in a limbo for recognition of potassium-dominant amphibole species. Consequently, several of the potassium-rich amphiboles compiled by Deer et al. (1997), as well as

  • Granodiorite - Wikipedia

    Granodiorite (/ ˌ ɡ r æ n oʊ ˈ d aɪ ə r aɪ t, -n ə-/) is a phaneritic-textured intrusive igneous rock similar to granite, but containing more plagioclase feldspar than orthoclase feldspar.According to the QAPF diagram, granodiorite has a greater than 20% quartz by volume, and between 65% to 90% of the feldspar is plagioclase. A greater amount of plagioclase would designate the rock as ...

  • Metamorphic rock - Wikipedia

    Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change.The protolith may be a sedimentary, igneous, or existing metamorphic rock.

  • Inosilicates (Pyroxenes and Amphiboles) - Tulane University

    Occurrence and Distinction of the Pyroxenes. Augite - is commonly found in both plutonic and volcanic igneous rocks, as well as high grade meta-igneous rocks like gneisses and granulites. It is easily distinguished from amphiboles by the nearly 90 o cleavage angles, and is distinguished from Opx by inclined extinction relative to the {110} cleavage, as discussed above.

  • Mode of occurrences and geochemistry of amphibole in the ...

    The A 3 amphiboles, associated with sulfide mineralization, are characteristically enriched in Cu, Ni and most other trace elements compared to the A 1 and A 2 amphiboles. This study thus suggests that the major and trace element compositions of amphibole can be used in differentiating mineralized vs. non-mineralized systems.

  • Asbestos fibre identification vs ... - SpringerLink

    May 11, 2014  An attempt to detect the occurrence of electron density at A, Am, and A2 failed in keeping with none or small (<0.01 apfu) cationic excess at M4 for all investigated samples. Preferred orientation for amphiboles was modelled by means of spherical harmonics (nine refinable parameters up to the 8th order).

  • (PDF) Occurrence and origin of Cl-rich amphibole and ...

    PDF Analyses of Cl-bearing amphiboles and biotites from more than 20 occurrences around the world have been reviewed. The Cl-content of amphibole ranges up to about 6 wt%, while the most Cl ...

  • Inosilicates (Pyroxenes and Amphiboles) - Tulane University

    Occurrence and Distinction of the Pyroxenes. Augite - is commonly found in both plutonic and volcanic igneous rocks, as well as high grade meta-igneous rocks like gneisses and granulites. It is easily distinguished from amphiboles by the nearly 90 o cleavage angles, and is distinguished from Opx by inclined extinction relative to the {110} cleavage, as discussed above.

  • Mode of occurrences and geochemistry of amphibole in the ...

    The A 3 amphiboles, associated with sulfide mineralization, are characteristically enriched in Cu, Ni and most other trace elements compared to the A 1 and A 2 amphiboles. This study thus suggests that the major and trace element compositions of amphibole can be used in differentiating mineralized vs. non-mineralized systems.

  • (PDF) Occurrence and origin of Cl-rich amphibole and ...

    PDF Analyses of Cl-bearing amphiboles and biotites from more than 20 occurrences around the world have been reviewed. The Cl-content of amphibole ranges up to about 6 wt%, while the most Cl ...

  • Amphiboles Phyllosilicates - tulane.edu

    Occurrence- Chlorite is a common mineral in low grade metamorphic rocks, where it occurs in association with minerals like actinolite, epidote, and biotite. It also forms as an alteration product of pyroxenes, amphiboles, biotite, and garnet in igneous as well a metamorphic rocks.

  • Occurrence and Chemical Compositions of Amphiboles in ...

    Occurrence and Chemical Compositions of Amphiboles in Altered Dioritic Rocks of Laiwu Skarn-Type Iron Deposit in West Shandong Area, China: Mineral proof of derivation of Fe-rich fluids

  • The occurrence of Zr-bearing amphiboles and their ...

    / The occurrence of Zr-bearing amphiboles and their relationships with the pyroxenes and biotites in the teschenite and nepheline syenites of a differentiated dolerite boss, Islay, NW Scotland. In: Mineralogical Magazine. 2000 ; Vol. 64. pp. 459-468.

  • Amphibole - Chemeketa Community College

    Hornblende is the name applied to the dark gray or essentially black-to-greenish black amphiboles that occur in many igneous rocks. The alkali-amphibole group includes three series whose individual members are relatively common in either metamorphic or alkalic igneous rocks. Hornblende uses include: decoration, dimension stone.

  • Amphibole asbestos soil contamination in the USA: A

    the amphiboles found in the soils would likely not meet the mineralogical definition of asbestos (i.e., they would not have been derived from asbestiform amphiboles); however, the majority would likely meet a commonly used regulatory definition of a fiber (i.e., are over 5

    Published in: American Mineralogist 2011Authors: Brittani D Thompson Mickey E Gunter Mickey E Gunter Michael A WilsonAffiliation: University of Idaho University of Vermont Natural Resources Conservation Service
  • Asbestos fibre identification vs ... - SpringerLink

    May 11, 2014  An attempt to detect the occurrence of electron density at A, Am, and A2 failed in keeping with none or small (<0.01 apfu) cationic excess at M4 for all investigated samples. Preferred orientation for amphiboles was modelled by means of spherical harmonics (nine refinable parameters up to the 8th order).

  • Differences Between Pyroxene and Amphibole Difference ...

    Pyroxene vs Amphibole. Crystals are basically forms of minerals that have the elements, atoms, molecules and ions in a structured pattern. Crystallography is the study of crystals wherein crystallographers use microscopes and other materials to study the different forms of crystals.

  • ASBESTOS (CHRYSOTILE, AMOSITE, CROCIDOLITE, TREMOLITE ...

    Current use of asbestos varies widely. While some countries have imposed strict regulations to limit exposure and others have adopted bans, some have intervened less, and continue to use varying quantities of asbestos ().According to recent estimates by the US Geological Survey, world production of asbestos in 2007 was 2.20 million metric tonnes, slightly increased from 2.18 million metric ton ...

  • Glaucophane - Wikipedia

    Occurrence. The blueschist metamorphic facies gets its name from abundant blue minerals glaucophane and lawsonite. Glaucophane generally forms in blueschist metamorphic rocks of gabbroic or basaltic composition that are rich in sodium and have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone.

  • Using the geologic setting of talc deposits as an ...

    Jan 21, 2004  The study found that the talc-forming environment directly influenced the amphibole and amphibole-asbestos content of the talc deposit. Large talc districts in the U.S. have mined hydrothermal talcs that replaced dolostone. Hydrothermal talcs, created by siliceous fluids heated by magmas at depth, consistently lack amphiboles as accessory minerals.

  • Augite - Occurrence, Properties, and Distribution

    Occurrence of Augite and Useful Mineral Association. Augite occurs in gabbro, basalt, mafic igneous rocks, metamorphosed iron formations, ultramafic rocks and some high-grade metamorphic rocks. It is closely associated with minerals like pyroxenes, amphiboles, leucite, olivine, labradorite, sanidine and orthoclase. References. Augite – Mindat

  • ASBESTOS (CHRYSOTILE, AMOSITE, CROCIDOLITE, TREMOLITE ...

    Current use of asbestos varies widely. While some countries have imposed strict regulations to limit exposure and others have adopted bans, some have intervened less, and continue to use varying quantities of asbestos ().According to recent estimates by the US Geological Survey, world production of asbestos in 2007 was 2.20 million metric tonnes, slightly increased from 2.18 million metric ton ...

  • Glaucophane - Wikipedia

    Occurrence. The blueschist metamorphic facies gets its name from abundant blue minerals glaucophane and lawsonite. Glaucophane generally forms in blueschist metamorphic rocks of gabbroic or basaltic composition that are rich in sodium and have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone.

  • Using the geologic setting of talc deposits as an ...

    Jan 21, 2004  The study found that the talc-forming environment directly influenced the amphibole and amphibole-asbestos content of the talc deposit. Large talc districts in the U.S. have mined hydrothermal talcs that replaced dolostone. Hydrothermal talcs, created by siliceous fluids heated by magmas at depth, consistently lack amphiboles as accessory minerals.

  • Augite - Occurrence, Properties, and Distribution

    Occurrence of Augite and Useful Mineral Association. Augite occurs in gabbro, basalt, mafic igneous rocks, metamorphosed iron formations, ultramafic rocks and some high-grade metamorphic rocks. It is closely associated with minerals like pyroxenes, amphiboles, leucite, olivine, labradorite, sanidine and orthoclase. References. Augite – Mindat

  • Occurrence of Excess 40Ar in Amphibole: Implications of ...

    The joint methods of 40 Ar/ 39 Ar laser stepwise heating and in vacuo crushing have been applied to date amphiboles from the North Qaidam ultra-high pressure metamorphic amphibolites. Two amphibole samples analyzed by laser heating yielded saddle-shaped age spectra with total gas ages of 574.5±2.5 and 562.5±2.5 Ma.

  • Background Information on Asbestos - Asbestos - NCBI Bookshelf

    Amphiboles are common silicate minerals found in many types of rocks. Although most occurrences of amphibole are non-asbestiform, large deposits of some asbestiform amphiboles have been exploited commercially, particularly from deposits in South Africa, Australia, and Finland.

  • Soapstone: The soft rock with incredible heat properties!

    Soapstone: A metamorphic rock that consists primarily of talc with varying amounts of other minerals such as micas, chlorite, amphiboles, pyroxenes, and carbonates. It is a soft, dense, heat-resistant rock that has a high specific heat capacity. These properties make it useful for a wide variety of architectural, practical, and artistic uses.

  • DIVERSITY AND OCCURRENCE OF POTASSIUM-DOMINANT AMPHIBOLES

    However, as a result of an evaluation of compositions of Cl-bearing amphibole samples from iron-oxide-rich ore systems and a comparison with data in the reviewed literature, fourteen additional naturally occurring potassium-dominant amphiboles can be justified from selected published chemical data using recommended protocols for normalization.

  • Types of Asbestos - Chyrsotile, Actinolite, Tremolite More

    The single type of asbestos from the serpentine family, chrysotile, has historically accounted for more than 95 percent of all asbestos used around the world. As a result of asbestos-industry lobbying, some countries that have banned other types of asbestos still permit the “controlled use” of chrysotile.

  • USGS Report: Dispersion of fibrous amphiboles by glacial ...

    used in combination with data from the reports mentioned below, especially the report of Alden (1953). The glacial history of the area was reconstructed to: (1) help identify the source areas of LA found in the lake sediments (Adams et al. 2010), (2) to explain the occurrence of the LA, and (3) to help define the potential distribution of the LA.

  • List of Minerals - sandatlas.org

    Occurrence: Chrysotile occurs in hydrothermally altered ultramafic rocks. Asbestiform chrysotile veins are cutting serpentinite rock that is mostly composed of the other two serpentine group minerals antigorite and lizardite. Uses: Chrysotile is the most widely used (98%) asbestos mineral. It is not anymore used as frequently as before because ...

  • Taramite Root Name: Mineral information, data and localities.

    1) The taramite root name was redefined from the Fe 2+ dominant species. The consequence of this is that all taramite group minerals without prefix pre-2012 will now have a ferro-prefix, and all taramite group minerals with a magnsio-prefix pre-2012 will now be without prefix.

  • Common Types of Asbestos Fibers, Serpentine Amphibole ...

    Types Of Asbestos Fibers Chrysotile Asbestos is Common in Consumer Products. Asbestos is the generic name for six naturally occurring minerals that have been used in commercial products for their strength, flexibility, low electrical conductivity, and resistance to heat and chemicals.

  • Asbestos Statistics and Information - usgs.gov

    Asbestos is a generic name given to six fibrous minerals that have been used in commercial products. The six types of asbestos are chrysotile, crocidolite, amosite, anthophyllite asbestos, tremolite asbestos, and actinolite asbestos. Several properties that make asbestos so versatile and cost effective are high tensile strength, chemical and thermal stability, high