Orthochrysotile (original) (raw)
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.
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Unique IdentifiersHide
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Mindat ID:
3025
Long-form identifier:
mindat:1:1:3025:6
GUID
(UUID V4):
811eeed8-da2a-4ad4-97d0-7917db1e278a
IMA Classification of OrthochrysotileHide
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Discredited
Classification of OrthochrysotileHide
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14.4.6
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
Physical Properties of OrthochrysotileHide
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Hardness:
2½ - 3 on Mohs scale
Optical Data of OrthochrysotileHide
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Type:
Biaxial (-)
RI values:
_n_α = 1.545 - 1.569 _n_β = 1.546 - 1.569 _n_γ = 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.
Surface Relief:
Low
Dispersion:
relatively weak
Crystallography of OrthochrysotileHide
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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 DiffractionHide
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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 OrthochrysotileHide
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German:Orthochrysotil
Other InformationHide
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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 OrthochrysotileHide
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mindat.org URL:
https://www.mindat.org/min-3025.html
Please feel free to link to this page.
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References for OrthochrysotileHide
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Reference List:
Burke, Ernst A. J. (2006) A mass discreditation of GQN minerals. The Canadian Mineralogist, 44 (6) 1557-1560 doi:10.2113/gscanmin.44.6.1557
(2023) Orthochrysotile. Handbook of Mineralogy. Mineralogical Society of America
Localities for OrthochrysotileHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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.