Orthochrysotile
A structural variant of Chrysotile
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Hardness:
2½ - 3
Crystal System:
Orthorhombic
Name:
Named in 1951 by Eric James William Whittaker for being an orthorhombic chrysotile.
A polytype of Chrysotile
Probably not uncommon polytype, but difficult to characterize as intermixed with the more common, monoclinic polytype clinocrysotile.
Originally described from Cuddapah, Chennai (Madras), Andhra Pradesh, India.
Probably not uncommon polytype, but difficult to characterize as intermixed with the more common, monoclinic polytype clinocrysotile.
Originally described from Cuddapah, Chennai (Madras), Andhra Pradesh, India.
Unique Identifiers
Mindat ID:
3025
Long-form identifier:
mindat:1:1:3025:6
GUID
(UUID V4):
(UUID V4):
811eeed8-da2a-4ad4-97d0-7917db1e278a
IMA Classification of Orthochrysotile
Discredited
Classification of Orthochrysotile
14.4.6
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
Physical Properties of Orthochrysotile
Hardness:
2½ - 3 on Mohs scale
Optical Data of Orthochrysotile
Type:
Biaxial (-)
RI values:
nα = 1.545 - 1.569 nβ = 1.546 - 1.569 nγ = 1.553 - 1.571
2V:
Measured: 20° to 60°
Max Birefringence:
δ = 0.008
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
relatively weak
Crystallography of Orthochrysotile
Crystal System:
Orthorhombic
Cell Parameters:
a = 5.34 Å, b = 9.24 Å, c = 14.2 Å
Ratio:
a:b:c = 0.578 : 1 : 1.537
Unit Cell V:
700.65 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.36 Å | (100) |
3.66 Å | (80) |
1.531 Å | (65) |
4.56 Å | (50) |
2.50 Å | (50) |
2.604 Å | (40) |
1.310 Å | (40) |
Other Language Names for Orthochrysotile
German:Orthochrysotil
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Orthochrysotile
mindat.org URL:
https://www.mindat.org/min-3025.html
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References for Orthochrysotile
Localities for Orthochrysotile
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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