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Grunerite

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predominantly in the eastern part of the Transvaal Province of South Africa. The origin of the name is Amosa, the acronym for the mining company "Asbestos Mines of South Africa". In industry Amosite is referred to as "brown asbestos".
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Sprays of small, prismatic grunerite crystals on matrix, field of view 5mm, from Marquette Co., Michigan, US
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prismatic. The luster is glassy to pearly with colors ranging from green, brown to dark grey. The
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series. It forms as fibrous, columnar or massive aggregates of crystals. The crystals are
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Scanning electron microscope image of asbestos fibres (grunerite var. amosite)
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Amosite is a rare asbestiform variety of grunerite that was mined as
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Index

Brown asbestos

Inosilicate
Formula
IMA symbol
Strunz classification
Crystal system
Monoclinic
Crystal class
H-M symbol
Space group
Formula mass
Crystal habit
Columnar
Mohs scale
Luster
Vitreous
Streak
Diaphaneity
Specific gravity
Density
Ultraviolet
fluorescence
amphibole
Fe
Si
O
OH
cummingtonite
monoclinic

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