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|System:||Orthorhombic||Hardness:||2½ - 3|
|Name:||Named in 1956 by Eric James William Whittaker from the Greek παρα "para" = beyond and chrysotile for its relationship to the root name mineral.|
A polytype of Chrysotile
Classification of Parachrysotile
|IMA status:||Discredited 2006|
|Explanation of status:||Polytype of Chrysotile|
|Strunz 8th edition ID:||8/H.27-50|
8 : Silicates
H : Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others
27 : Serpentine group
|Hey's CIM Ref.:||14.4.7|
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
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Physical Properties of Parachrysotile
|Hardness (Mohs):||2½ - 3|
Crystallography of Parachrysotile
|Cell Parameters:||a = 5.3Å, b = 9.24Å, c = 14.71Å|
|Ratio:||a:b:c = 0.574 : 1 : 1.592|
|Unit Cell Volume:||V 720.38 Å³ (Calculated from Unit Cell)|
Optical Data of Parachrysotile
|RI values:||nα = 1.545 - 1.569 nβ = 1.546 - 1.569 nγ = 1.553 - 1.571|
|2V:||Measured: 20° to 60°|
|Maximum Birefringence:||δ = 0.008|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Relationship of Parachrysotile to other Species
|Member of:||Kaolinite-Serpentine Group|
|Other Members of Group:|
|Related Minerals - Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Parachrysotile
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Parachrysotile
Whittaker, E.J.W. (1956b) The structure of chrysotile . IV. Parachrysotile. Acta Crystallographica: 9: 865-867.
American Mineralogist (1957): 42: 585.
Internet Links for Parachrysotile
Localities for Parachrysotile
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Mount Vernon meteorite, Christian Co., Kentucky, USAFrom Lon Clay Hill, 25th Oct 2014 03:02:01