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Parachrysotile

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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

Discredited 2006
Explanation of status:
Polytype of Chrysotile
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
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Physical Properties of Parachrysotile

Hardness (Mohs):
2½ - 3

Crystallography of Parachrysotile

Crystal System:
Orthorhombic
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 ų (Calculated from Unit Cell)

Optical Data of Parachrysotile

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

Relationship of Parachrysotile to other Species

Other Members of Group:
AmesiteMg2Al(AlSiO5)(OH)4
AntigoriteMg3(Si2O5)(OH)4
Baumite(Mg,Al,Mn,Zn,Fe)3(Si,Al)2O5(OH)4
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4
Caryopilite(Mn,Mg)3(Si2O5)(OH)4
ChrysotileMg3(Si2O5)(OH)4
Clinochrysotile
CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
DickiteAl2(Si2O5)(OH)4
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
GreenaliteFe2-3(Si2O5)(OH)4
HalloysiteAl2(Si2O5)(OH)4
KaoliniteAl2(Si2O5)(OH)4
KellyiteMn22+Al(AlSiO5)(OH)4
LizarditeMg3(Si2O5)(OH)4
ManandoniteLi2Al4(Si2AlB)O10(OH)8
NacriteAl2(Si2O5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4
Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4
Orthochrysotile
PecoraiteNi3(Si2O5)(OH)4
Webskyite
8/H.27-10AntigoriteMg3(Si2O5)(OH)4
8/H.27-20LizarditeMg3(Si2O5)(OH)4
8/H.27-40Orthochrysotile
8/H.27-55Caryopilite(Mn,Mg)3(Si2O5)(OH)4
8/H.27-60GreenaliteFe2-3(Si2O5)(OH)4
8/H.27-70Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
8/H.27-80Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
8/H.27-95DozyiteMg7Al2(Al2Si4O15)(OH)12
8/H.27-100AmesiteMg2Al(AlSiO5)(OH)4
8/H.27-110KellyiteMn22+Al(AlSiO5)(OH)4
8/H.27-120CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
8/H.27-140Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
8/H.27-150Népouite(Ni,Mg)3(Si2O5)(OH)4
8/H.27-160PecoraiteNi3(Si2O5)(OH)4
8/H.27-170Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4
8/H.27-190Carlosturanite(Mg,Fe,Ti)21(Si,Al)12O28(OH)34•H2O
14.4.1ForsteriteMg2SiO4
14.4.2EnstatiteMgSiO3
14.4.3ClinoenstatiteMgSiO3
14.4.4ChrysotileMg3(Si2O5)(OH)4
14.4.5Clinochrysotile
14.4.6Orthochrysotile
14.4.8LizarditeMg3(Si2O5)(OH)4
14.4.9TalcMg3(Si4O10)(OH)2
14.4.10SpadaiteMgSiO2(OH)2 · H2O (?)
14.4.11SepioliteMg4(Si6O15)(OH)2 · 6H2O
14.4.12LoughliniteNa2Mg3Si6O16 · 8H2O
14.4.13EifeliteKNa3Mg4Si12O30
14.4.14Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
14.4.15AntigoriteMg3(Si2O5)(OH)4
14.4.16 Magnesio-anthophyllite

Other Names for Parachrysotile

Name in Other Languages:

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.

References for Parachrysotile

Reference List:
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

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
No reference listed
Zimbabwe
 
  • Midlands
    • Zvishavane District
      • Zvishavane (Shabani; Shabanie; Shavani)
Handbook of Mineralogy
Mineral and/or Locality  
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