Asbestos Fibers and Other Elongate Mineral Particles: State of the ...
Asbestos Fibers and Other Elongate Mineral Particles: State of the ...
Asbestos Fibers and Other Elongate Mineral Particles: State of the ...
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Table 2. Definitions <strong>of</strong> specific minerals (Continued)<br />
Glossary <strong>of</strong> Geology, 5th ed.<br />
[American Geological Institute 2005] Leake et al. [1997] NIOSH [1990a]<br />
Dictionary <strong>of</strong> Mining,<br />
<strong>Mineral</strong>, <strong>and</strong> Related Terms<br />
[U.S. Bureau <strong>of</strong> Mines 1996]<br />
[Note: Footnotes identify <strong>the</strong> Primary<br />
Source Citation for <strong>the</strong> definition]<br />
Term<br />
NIOSH CIB 62 • <strong>Asbestos</strong><br />
A colorless or white monoclinic zeolite<br />
mineral. Usually designated as phillipsite<br />
– (Ca, K, or Na) depending on which<br />
is <strong>the</strong> dominant exchangeable cation,<br />
(Ca,K,Na) •<br />
2(Si,Al) 8O16 6H2O.<br />
Phillipsite A monoclinic mineral, (K,Na,Ca) 1-<br />
2(Si,Al) 8O16.6H2O; zeolite group;<br />
commonly occurs in complex<br />
twinned crystals; in basalt<br />
amydules, in pelagic red clays, in<br />
palagonite tuffs, in alkaline saline<br />
lakes from silicic vitric volcanic<br />
ash, in alkaline soils, <strong>and</strong> around<br />
hot springs in Roman baths.<br />
A monoclinic sodic-calcic<br />
amphibole: Na(CaNa)<br />
Mg5Si8O22(OH) 2; may also<br />
contain divalent iron but<br />
with Mg/(Mg+Fe2+ ) ≥ 0.5<br />
(o<strong>the</strong>rwise it is ferrorichterite)<br />
Richterite A brown, yellow, or rose-red monoclinic<br />
member <strong>of</strong> <strong>the</strong> amphibole group:<br />
Na2CaMg5Si8O22(OH) 2. Cf: soda tremolite<br />
A monoclinic sodic amphibole:<br />
Na2(Fe2+ 3Fe3+ 2)Si8O22(OH) 2;<br />
may also contain aluminum<br />
in place <strong>of</strong> trivalent iron but<br />
with VIAl < Fe3+ o<strong>the</strong>rwise it is<br />
ferroglaucophane, <strong>and</strong> may also<br />
contain sodium <strong>and</strong> potassium<br />
in <strong>the</strong> A position but with<br />
(Na+K) A < 0.50 o<strong>the</strong>rwise it<br />
is arfvedsonite, <strong>and</strong> may also<br />
contain magnesium in place<br />
<strong>of</strong> divalent iron but with Mg/<br />
(Mg+Fe2+ ) < 0.5 o<strong>the</strong>rwise<br />
it is magnesioriebeckite<br />
A dark blue or black monoclinic mineral <strong>of</strong> <strong>the</strong><br />
amphibole group: Na2Fe2+ 3Fe3+ 2Si8O22(OH) 2. It<br />
occurs as a primary constituent in some acid or<br />
sodium-rich igneous rocks. See also: crocidolite<br />
Riebeckite A monoclinic mineral, Na2Ca (Mg,Fe2+ ) 5Si8O22(OH) 2 [sic];<br />
amphibole group with Mg/<br />
(Mg+Fe2+ ) = 0 to 0.49 <strong>and</strong> Fe3+ /<br />
(Fe3+ +Al) = 0.7 to 1.0; forms a<br />
series with magnesioriebeckite;<br />
fibrous; in soda-rich rhyolites,<br />
granites, <strong>and</strong> pegmatites;<br />
crocidolite variety is blue<br />
asbestos; tiger eye is crocidolite<br />
replaced by quartz.<br />
See footnotes at end <strong>of</strong> table. (Continued)<br />
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