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2½ - 3
Crystal System:
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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Classification of OrthochrysotileHide


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

14 : Silicates not Containing Aluminum
4 : Silicates of Mg

Physical Properties of OrthochrysotileHide

2½ - 3 on Mohs scale

Optical Data of OrthochrysotileHide

Biaxial (-)
RI values:
nα = 1.545 - 1.569 nβ = 1.546 - 1.569 nγ = 1.553 - 1.571
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:
relatively weak

Crystallography of OrthochrysotileHide

Crystal System:
Cell Parameters:
a = 5.34 Å, b = 9.24 Å, c = 14.2 Å
a:b:c = 0.578 : 1 : 1.537
Unit Cell V:
700.65 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
7.36 (100)
3.66 (80)
1.531 (65)
4.56 (50)
2.50 (50)
2.604 (40)
1.310 (40)

Other Language Names for OrthochrysotileHide

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.27-70Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
8/H.27-100AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
8/H.27-110KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 : P63
8/H.27-120CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
8/H.27-140Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)

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. 2/m : P21/b
14.4.5ClinochrysotileMon. 2/m
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.
14.4.15AntigoriteMg3(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 OrthochrysotileHide

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. III. Orthochrysotile. Acta Crystallographica: 9: 862-864.
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 OrthochrysotileHide

Localities for OrthochrysotileHide

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.
  • Québec
    • Estrie
      • Les Sources RCM
        • Asbestos
Van King
  • Jilin
    • Tonghua
      • Ji'an Co.
Youqin Li, Shaoying Jiang, and Wenwei Fan (1981): Chinese Journal of Geology 24(3)
  • Andhra Pradesh
    • YSR District (Cuddapah District)
Rev. Min. (1988), 91
  • Kumamoto
    • Yatsushiro City
Satomi Enju, Seiichiro Uehara (2018) Polygonal serpentine and chrysotile in serpentine veins from Shimodake serpentinite body, Izumi, Yatsushiro, Kumamoto Prefecture, Japan. in abstracts of the 22nd IMA Meeting Melbourne
  • Yamaguchi
    • Iwakuni City
      • Nishiki-cho
Motoiki Saito (1973) Some serpentine minerals occurring in Yamaguchi prefecture, Japan. Journal of Science of the Hiroshima University, series C, 7, 21-36.
        • Mitake
Motoiki Saito (1973) Some serpentine minerals occurring in Yamaguchi prefecture, Japan. Journal of Science of the Hiroshima University, series C, 7, 21-36.
  • Buskerud
    • Kongsberg
Bancroft, P., Nordrum, F.S. & Lyckberg, P.(2001): Kongsberg revisited. Mineralogical Record 32: 181-205
  • Hhohho District
    • Bulembu (Havelock)
Canadian Mineralogist (1979) 17:679-691
  • Jönköping
    • Jönköping
      • Månsarp
Hans Thulin
  • Grischun (Grisons; Graubünden)
    • Albula Valley
      • Landwasser Valley
        • Davos
          • Wolfgang
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 114-115.
  • Arizona
    • Gila Co.
      • Fort Apache Indian Reservation
        • Salt River
Tony Nikischer
      • Salt River District
        • Chrysotile area
Tony Nikischer
  • California
    • Calaveras Co.
      • West Belt
    • San Francisco Co.
Schlocker, J. (1974) Geology of the San Francisco North quadrangle. USGS Professional Paper 782, 109 pp.: 58; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 424.
  • Nevada
    • Eureka Co.
NBMG Spec. Pub. 31 Minerals of Nevada
    • Nye Co.
      • Paradise Range
        • Gabbs District
          • Gabbs
NBMG Spec. Pub. 31 Minerals of Nevada
  • New Jersey
    • Sussex Co.
      • Franklin mining district
  • Vermont
    • Orleans & Lamoille Cos.
      • Lowell & Eden
Chidester, A.H., Albee, A.L., and Cady, W.M., (1978). Petrology, structure and genesis of the asbestos-bearing ultramafic rocks of the Belvidere Mountain area in Vermont: U.S. Geologic Survey Professional Paper 1016
Mineral and/or Locality  
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