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Orthochrysotile

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System:OrthorhombicHardness:2½ - 3
Member of:Kaolinite-Serpentine Group
Name:Named in 1951 by Eric James William Whittaker for being an orthorhombic chrysotile.
A polytype of Chrysotile

Originally described from Cuddapah, Chennai (Madras), Andhra Pradesh, India.

Classification of Orthochrysotile

IMA status:Discredited 2006
Explanation of status:A polytype of chrysotile
Strunz 8th edition ID:8/H.27-40

8 : Silicates
H : Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others
27 : Serpentine group
Hey's CIM Ref.:14.4.6

14 : Silicates not Containing Aluminum
4 : Silicates of Mg
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Physical Properties of Orthochrysotile

Hardness (Mohs):2½ - 3

Crystallography of Orthochrysotile

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

Optical Data of Orthochrysotile

Type:Biaxial (-)
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.
Surface Relief:Low
Dispersion:relatively weak

Relationship of Orthochrysotile to other Species

Member of:Kaolinite-Serpentine Group
Other Members of Group:

- +
Amesite
Mg
 
2
Al(AlSiO
 
5
)(OH)
 
4
Antigorite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Baumite
(Mg,Al,Mn,Zn,Fe)
 
3
(Si,Al)
 
2
O
 
5
(OH)
 
4
Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
2-3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
Brindleyite
(Ni,Al)
 
3
(Si,Al)
 
2
O
 
5
(OH)
 
4
Caryopilite
(Mn,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Chrysotile
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Clinochrysotile
Cronstedtite
Fe
2+
2
Fe
3+
 
((Si,Fe
3+
 
)
 
2
O
 
5
)(OH)
 
4
Dickite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Fraipontite
(Zn,Al)
 
3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
Greenalite
Fe
 
2-3
(Si
 
2
O
 
5
)(OH)
 
4
Halloysite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Kaolinite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
Lizardite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Manandonite
Li
 
2
Al
 
4
(Si
 
2
AlB)O
 
10
(OH)
 
8
Nacrite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Népouite
(Ni,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
((Si,Al)
 
2
O
 
5
)(OH)
 
4
Parachrysotile
Pecoraite
Ni
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Related Minerals - Strunz Grouping):

- +
8/H.27-10Antigorite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
8/H.27-20Lizardite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
8/H.27-50Parachrysotile
8/H.27-55Caryopilite
(Mn,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
8/H.27-60Greenalite
Fe
 
2-3
(Si
 
2
O
 
5
)(OH)
 
4
8/H.27-70Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
2-3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
8/H.27-80Fraipontite
(Zn,Al)
 
3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
8/H.27-95Dozyite
Mg
 
7
Al
 
2
(Al
 
2
Si
 
4
O
 
15
)(OH)
 
12
8/H.27-100Amesite
Mg
 
2
Al(AlSiO
 
5
)(OH)
 
4
8/H.27-110Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
8/H.27-120Cronstedtite
Fe
2+
2
Fe
3+
 
((Si,Fe
3+
 
)
 
2
O
 
5
)(OH)
 
4
8/H.27-140Karpinskite
(Ni,Mg)
 
2
Si
 
2
O
 
5
(OH)
 
2
(?)
8/H.27-150Népouite
(Ni,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
8/H.27-160Pecoraite
Ni
 
3
(Si
 
2
O
 
5
)(OH)
 
4
8/H.27-170Brindleyite
(Ni,Al)
 
3
(Si,Al)
 
2
O
 
5
(OH)
 
4
8/H.27-190Carlosturanite
(Mg,Fe,Ti)
 
21
(Si,Al)
 
12
O
 
28
(OH)
 
34
•H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.4.1Forsterite
Mg
 
2
SiO
 
4
14.4.2Enstatite
MgSiO
 
3
14.4.3Clinoenstatite
MgSiO
 
3
14.4.4Chrysotile
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
14.4.5Clinochrysotile
14.4.7Parachrysotile
14.4.8Lizardite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
14.4.9Talc
Mg
 
3
(Si
 
4
O
 
10
)(OH)
 
2
14.4.10Spadaite
MgSiO
 
2
(OH)
 
2
· H
 
2
O (?)
14.4.11Sepiolite
Mg
 
4
(Si
 
6
O
 
15
)(OH)
 
2
· 6H
 
2
O
14.4.12Loughlinite
Na
 
2
Mg
 
3
Si
 
6
O
 
16
· 8H
 
2
O
14.4.13Eifelite
KNa
 
3
Mg
 
4
Si
 
12
O
 
30
14.4.14Stevensite
(Ca,Na)
 
x
Mg
 
3-x
(Si
 
4
O
 
10
)(OH)
 
2
14.4.15Antigorite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
14.4.16 Magnesio-anthophyllite

Other Names for Orthochrysotile

Other Languages:
German:Orthochrysotil

Other Information

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 Orthochrysotile

Reference List:

- +
Whittaker, E.J.W. (1956b) The structure of chrysotile . III. Orthochrysotile. Acta Crystallographica: 9: 862-864.

Internet Links for Orthochrysotile

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  • External Links:
  • Orthochrysotile details from Handbook of Mineralogy (PDF)
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  • Orthochrysotile specimens for sale - minfind.com
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  • Localities for Orthochrysotile

    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.
    Canada
     
    • Québec
      • Estrie
        • Les Sources RCM
          • Asbestos
    Van King
    China
     
    • Jilin Province (Manchuria; Dongbei Region)
      • Tonghua Prefecture
        • Ji'an Co.
    Youqin Li, Shaoying Jiang, and Wenwei Fan (1981): Chinese Journal of Geology 24(3)
    India
     
    • Andhra Pradesh
      • YSR District (Cuddapah District)
    Rev. Min. (1988), 91
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Yamaguchi Prefecture
          • 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.
    Norway
     
    • Buskerud
      • Kongsberg
    Bancroft, P., Nordrum, F.S. & Lyckberg, P.(2001): Kongsberg revisited. Mineralogical Record 32: 181-205
    Swaziland
     
    • Hhohho District
      • Bulembu (Havelock)
    Canadian Mineralogist (1979) 17:679-691
    Sweden
     
    • Småland
      • Jönköping
        • Månsarp
    Hans Thulin
    Switzerland
     
    • 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.
    USA
     
    • Arizona
      • Gila Co.
        • Fort Apache Indian Reservation
          • Salt River
    Tony Nikischer
        • Salt River District
          • Chrysotile area
    Tony Nikischer
    • California
      • Calaveras Co.
        • Copperopolis
      • 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.
        • Gabbs District
    NBMG Spec. Pub. 31 Minerals of Nevada
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
    Dunn(1995):Pt4:485.
    • 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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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