This article is about the form of asbestos. For the types of gemstone, see Chrysolite.
Chrysotile
General
Category
Phyllosilicates Kaolinite-serpentine group
Formula (repeating unit)
Mg3(Si2O5)(OH)4 (ideal)
IMA symbol
Ctl[1]
Strunz classification
9.ED.15
Crystal system
Monoclinic: clinochrysotile (most common) Orthorhombic: orthochrysotile and parachrysotile (both rare)
Crystal class
Clinochrysotile: prismatic (2/m) Orthochrysotile and parachrysotile: pyramidal (mm2)
Space group
Clinochrysotile: C2/m Orthochrysotile and parachrysotile: Ccm21
Identification
Formula mass
277.11 g/mol (ideal)
Colour
White to greyish green
Crystal habit
Acicular
Fracture
Fibrous
Mohs scale hardness
2.5–3
Lustre
Silky
Streak
White
Diaphaneity
Translucent
Density
2.53 g/ml
Optical properties
Biaxial (+)
Refractive index
nα = 1.569, nγ = 1.570
Birefringence
0.001 (max)
Dispersion
Relatively weak
Extinction
parallel
Melting point
600–850 °C (1,112–1,562 °F) (decomposes)
Fusibility
dehydrates at 550–750 °C (1,022–1,382 °F)
Diagnostic features
White to grayish green thin, flexible curved fiber
Solubility
Insoluble in water Fibres degrade in dilute acid
References
[2][3][4]
Chrysotile or white asbestos is the most commonly encountered form of asbestos,[5] accounting for approximately 95% of the asbestos in the United States[6] and a similar proportion in other countries.[7] It is a soft, fibrous silicate mineral in the serpentine subgroup of phyllosilicates; as such, it is distinct from other asbestiform minerals in the amphibole group. Its idealized chemical formula is Mg3(Si2O5)(OH)4.[5] The material has physical properties which make it desirable for inclusion in building materials, but poses serious health risks when dispersed into air and inhaled.
^ ab"Asbestos" (PDF). Report on Carcinogens, Eleventh Edition. U.S. Department of Health and Human Services. 2005.
^Occupational Safety and Health Administration, U.S. Department of Labor (2007). 29 C.F.R. 1910.1001. Appendix J.
^Institut national de recherche sur la sécurité (1997). "Amiante Archived 2008-06-25 at the Wayback Machine." Fiches toxicologiques. n° 167. (in French)
Chrysotile or white asbestos is the most commonly encountered form of asbestos, accounting for approximately 95% of the asbestos in the United States and...
structure. Chrysotile (commonly known as white asbestos) is the only asbestos mineral in the serpentine group. In the United States, chrysotile has been...
important mineral polymorphs of serpentine: antigorite, lizardite and chrysotile. Serpentine minerals are polymorphous, meaning that they have the same...
government would no longer oppose inclusion of chrysotile in the convention. Eight of the largest chrysotile producing and exporting countries opposed such...
are linked to chrysotile and asbestos exposure. Public health authorities generally recommend against inhaling brake dust, chrysotile has been banned...
mineral composition of serpentinite is usually dominated by lizardite, chrysotile (two minerals of the serpentine subgroup), and magnetite (Fe3O4). Brucite...
serpentinization include the serpentine group minerals (antigorite, lizardite, chrysotile), brucite, talc, Ni-Fe alloys, and magnetite. The mineral alteration is...
research?] Until 1984 the Artex coating was made with white asbestos (Chrysotile) to strengthen it. It is also worth noting that the texture is only harmful...
xenoliths erupted in kimberlite and alkali basalt. Diopside is a precursor of chrysotile (white asbestos) by hydrothermal alteration and magmatic differentiation;...
ended in 1980. AIB is 16-35% asbestos, typically a blend of amosite and chrysotile, though crocidolite was also used in early boards. AIB is softer, more...
activities may expose themselves to asbestos dust. In the UK, use of chrysotile asbestos was banned at the end of 1999. Brown and blue asbestos were banned...
mineral fiber. Six minerals have been classified as "asbestos" including chrysotile of the serpentine class and those belonging to the amphibole class: amosite...
group; silky which is common in fibrous minerals such as asbestiform chrysotile. The diaphaneity of a mineral describes the ability of light to pass through...
Fibrous tremolite is sometimes found as a contaminant in vermiculite, chrysotile (itself a type of asbestos) and talc. Tremolite is an indicator of metamorphic...
crocidolite are considered the most hazardous asbestos fiber types; however, chrysotile asbestos has also produced tumors in animals and is a recognized cause...
cabochons and beads. The magnesian serpentines (antigorite, lizardite, chrysotile) are trioctahedral hydrous phyllosilicates. Their structure is based on...
calcite, aragonite, dolomite, magnesite, hydromagnesite, artinite, talc and chrysotile. It adopts a layered CdI2-like structure with hydrogen-bonds between the...
on use of chrysotile asbestos in India to protect the workers and the general population against primary and secondary exposure to Chrysotile form of Asbestos...
rocks. Associated minerals include brucite, hydromagnesite, pyroaurite, chrysotile, aragonite, calcite, dolomite and magnesite. It was first reported in...
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