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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.

Occurrence and chemical composition of amphiboles and ...

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

DIVERSITY AND OCCURRENCE OF POTASSIUMDOMINANT AMPHIBOLES …

However, as a result of an evaluation of compositions of Clbearing amphibole samples from ironoxiderich ore systems and a comparison with data in the reviewed literature, fourteen additional naturally occurring potassiumdominant amphiboles can be justified from selected published chemical data using recommended protocols for normalization.

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 (< 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).

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

Ross M, Virta RL (2001) Occurrence, production and uses of asbestos. In: Nolan RP, Langer AM, Ross M, Wicks FJ, Martin RF (eds) The health effects of chrysotile asbestos: contribution of science to riskmanagement decisions. The Canadian Mineralogist Special Publication 5, pp 79–88 Google Scholar

Background Information on Asbestos Asbestos NCBI Bookshelf

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

Amphiboles Phyllosilicates

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.

Asbestos, its Chemical and Physical Properties: Second in ...

Their occurrence in industry has been less extensive. Tremolite has been used in laboratories for filtering chemicals. Actinolite is used for industrial asbestos. There is not much reported use of anthophyllite. All three of these amphiboles also have nonasbestos forms associated with them in nature. Unique structure

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. nonmineralized systems.

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.

Asbestos: Geology, Mineralogy, Mining, and Uses USGS

Asbestos: Geology, Mineralogy, Mining, and Uses by Robert L. Virta1 OpenFile Report 02149 Prepared in cooperation with KirkOthmer Encyclopedia of Chemical Technology, Online Edition, WylieInterscience, a division of John Wiley Sons, Inc., New York, NY

Asbestos Wikipedia

Asbestos (pronounced: / æ s ˈ b ɛ s t ə s / or / æ s ˈ b ɛ s t ɒ s /) is a term used to refer to six naturally occurring silicate minerals. All are composed of long and thin fibrous crystals, each fiber being composed of many microscopic 'fibrils' that can be released into the atmosphere by abrasion and other processes.

Amphibole Chemeketa Community College

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

A Few Minerals That Contain Pyroxene ThoughtCo

In the field, usually, the most you can do is note darkgreen or black minerals with Mohs hardness of 5 or 6 and two good cleavages at right angles and call it "pyroxene." The square cleavage is the main way to tell pyroxenes from amphiboles; pyroxenes also form stubbier crystals.

Amphiboles Crystal Chemistry Phase Relations and ...

This series of monographs represents continuation on an international basis of the previous series MINERALOGIE UNO PETROGRAPHIE IN EINZELOARSTELLUNGEN, published by SpringerVerlag. The voluminous results arising from recent progress in pure and applied re­ search increase the need for

Granodiorite Wikipedia

Biotite and amphiboles often in the form of hornblende are more abundant in granodiorite than in granite, giving it a more distinct twotoned or overall darker appearance. Mica may be present in wellformed hexagonal crystals, and hornblende may appear as needlelike crystals.

Reported Historic Asbestos Mines, Historic Asbestos ...

Ross, Malcolm, and Nolan, , 2003, History of asbestos discovery and use and asbestosrelated 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. 447470.

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. It is composed of silicon, oxygen, hydrogen, and various metals.

Minerals Silicates

Subgroup General structure Examples Occurrence uses Chain tetrahedra in chains silicates single chains: pyroxenes augite (complex iron silicapoor igneous metamorphic silicate) rocks double chains: amphiboles hornblende (complex silicarich igneous and highgrade iron silicate) metamorphic rocks actinolite (complex

Chapter Asbestos World Health Organization

(d) transport and use of asbestoscontaining 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

Hornblende Mineral | Uses and Properties

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

Volume 41 December 2003 Part 6

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 potassiumdominant amphibole species. Consequently, several of the potassiumrich amphiboles compiled by Deer et al. (1997), as well as

Amphiboles from the Metamorphic Manganese Ores of Central ...

The use of the name tirodite for amphiboles of different compositions has led to a common misconception that any "tirodite" equals ferrighoseite, even though the name has been reserved for Nafree MnMgamphiboles (Mn analogue of cummingtonite) since the first official amphibole nomenclature was published in 1978.

University of Minnesota’s Mineral Pages: Pyroxene

The pyroxenes are single chain silicates, while the amphiboles are double chain silicates. In general, pyroxene crystals tend to be stubbier than the more elongated amphibole crystals, but the crystal shapes may be very similar in those amphiboles that formed from the alteration of pyroxenes.

University of Minnesota’s Mineral Pages: Amphibole

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 …

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 ...

Amphibolite: Metamorphic Rock Pictures, Definition More

Amphibole Amphibole Physical properties: Long prismatic, acicular, or fibrous crystal habit, Mohs hardness between 5 and 6, and two directions of cleavage intersecting at approximately 56° and 124° generally suffice to identify amphiboles in hand specimens. The specific gravity values of amphiboles range from about to Amphiboles yield water when heated in a closed tube and fuse ...

EENS 2110 Mineralogy Tulane University Prof. Stephen A ...

Occurrence and Distinction of the Pyroxenes Augite is commonly found in both plutonic and volcanic igneous rocks, as well as high grade metaigneous rocks like gneisses and granulites. It is easily distinguished from amphiboles by the nearly 90ocleavage angles, and is …

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 asbestosindustry lobbying, some countries that have banned other types of asbestos still permit the “controlled use” of chrysotile.

Pyroxene Group Minerals | Physical Optical Properties ...

Unlike amphiboles, pyroxenes do not yield water when heated in a closed tube. Characteristically, pyroxenes are darkish green to black in colour, however they can range from darkish inexperienced to applegreen and from lilac to colourless, depending at the chemical composition. ... Origin and Occurrence of Pyroxene. Minerals in the pyroxene ...

The classification and interpretation of Amphiboles ...

This thesis reports a study of 2650 published chemical analyses of members of the Amphioole group of minerals with a view to deriving a satisfactory nomenclature for the amphiboles, to outline the overall chemical variation exhibited by the group and the relation between amphibole composition and mode of occurrence. To achieve these' aims a computer program was developed to calculate atomic ...