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Parachrysotile

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Hardness:
2½ - 3
Crystal System:
Orthorhombic
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


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Classification of ParachrysotileHide

Discredited
8/H.27-50

8 : Silicates
H : Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others
27 : Serpentine group
14.4.7

14 : Silicates not Containing Aluminum
4 : Silicates of Mg

Physical Properties of ParachrysotileHide

Hardness:
2½ - 3 on Mohs scale

Optical Data of ParachrysotileHide

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.
Surface Relief:
Low
Dispersion:
relatively weak

Crystallography of ParachrysotileHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.3 Å, b = 9.24 Å, c = 14.71 Å
Ratio:
a:b:c = 0.574 : 1 : 1.592
Unit Cell V:
720.38 ų (Calculated from Unit Cell)

Other Language Names for ParachrysotileHide

Relationship of Parachrysotile to other SpeciesHide

Other Members of this group:
OrthochrysotileOriginally described from Cuddapah, Chennai (Madras), Andhra Pradesh, India.Orth.

Related Minerals - Nickel-Strunz Grouping (8th Edition)Hide

8/H.27-ClinochrysotileMon. 2/m
8/H.27-10AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
8/H.27-20LizarditeMg3(Si2O5)(OH)4
8/H.27-40OrthochrysotileOrth.
8/H.27-55CaryopiliteMn2+3Si2O5(OH)4Mon.
8/H.27-60Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4Mon.
8/H.27-70Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
8/H.27-80Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
8/H.27-95DozyiteMg7Al2(Al2Si4O15)(OH)12Mon.
8/H.27-100AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
8/H.27-110KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
8/H.27-120CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
8/H.27-140Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
8/H.27-150Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
8/H.27-160PecoraiteNi3(Si2O5)(OH)4Mon.
8/H.27-170Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
8/H.27-190Carlosturanite(Mg,Fe,Ti)21(Si,Al)12O28(OH)34•H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.4.1ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
14.4.2EnstatiteMgSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
14.4.3ClinoenstatiteMgSiO3Mon.
14.4.4ChrysotileMg3(Si2O5)(OH)4Mon.
14.4.5ClinochrysotileMon. 2/m
14.4.6OrthochrysotileOrth.
14.4.8LizarditeMg3(Si2O5)(OH)4
14.4.9TalcMg3Si4O10(OH)2Tric. 1 : P1
14.4.10SpadaiteMgSiO2(OH)2 · H2O (?)
14.4.11SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
14.4.12LoughliniteNa2Mg3Si6O16 · 8H2OOrth.
14.4.13EifeliteKNa3Mg4Si12O30Hex.
14.4.14Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
14.4.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
14.4.16 Magnesio-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ParachrysotileHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Whittaker, E.J.W. (1956) The structure of chrysotile. IV. Parachrysotile. Acta Crystallographica: 9: 865-867.
American Mineralogist (1957) 42: 585.
Wicks, F.J. and Whittaker, E.J.W. (1975) A reappraisal of the structures of the serpentine minerals. Canadian Mineralogist: 13(3): 227-243.
Burke, E.A.J. (2006) A mass discreditation of GQN minerals. The Canadian Mineralogist: 44(6): 1557-1560.

Internet Links for ParachrysotileHide

Localities for ParachrysotileHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Saxony
    • Chemnitz
      • Markersdorf
Wittern: "Mineralfundorte in Deutschland", 2001
South Africa
 
  • Mpumalanga Province
    • Ehlanzeni District
      • Barberton
        • Kaapsche Hoop (Kaapsehoop)
Minerals of South Africa
Swaziland
 
  • Hhohho District
    • Bulembu (Havelock)
Canadian Mineralogist (1979) 17:679-691
USA
 
  • Nevada
    • Nye Co.
      • Paradise Range
        • Gabbs District
          • Gabbs
NBMG Spec. Pub. 31 Minerals of Nevada
Zimbabwe
 
  • Midlands
    • Zvishavane District
      • Zvishavane (Shabani; Shabanie; Shavani)
Handbook of Mineralogy
Mineral and/or Locality  
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