Orthochrysotile Mineral Data

Orthochrysotile Mineral Data +

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General Orthochrysotile Information

Chemical Formula:

Mg3Si2O5(OH)4

Composition:

Molecular Weight = 277.11 gm

Magnesium 26.31 % Mg 43.63 % MgO

Silicon 20.27 % Si 43.36 % SiO₂

Hydrogen 1.45 % H 13.00 % H₂O

Oxygen 51.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃Si₂O₅(OH)₄

Environment:

Metamorphosed and hydrothermally-altered ultra-basic rocks.

IMA Status:

Valid Species (Pre-IMA) 1951

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the orthorhombic crystal symmetry and Greek chrysos - "gold" and tilos - "fiber."

Synonym:

Asbestos

Chrysotile

Mitaxite - splintery

Orthochrysotile Image

Images:

Orthochrysotile

Comments: Pale tan asbestos fiber (orthochrysotile) vein in rock.
Location: El Dorado Mine, Salt River Canyon, Gila County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orthochrysotile Crystallography

Axial Ratios:

a:b:c =0.5772:1:1.5351

Cell Dimensions:

a = 5.34, b = 9.25, c = 14.2, Z = 4; V = 701.41 Den(Calc)= 2.62

Crystal System:

OrthorhombicSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.1(1), 2.33(0.8), 3.55(0.7),2.5(0.5), 4.4(0.4), 1.615(0.3), 3.88(0.3), 4.63(0.2),

Physical Properties of Orthochrysotile

Cleavage:

[???] Distinct

Color:

Brownish, Colorless, Green, Gray, Gray brown.

Density:

2.53 - 2.65, Average = 2.59

Diaphaniety:

Translucent to opaque

Fracture:

Fibrous - Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos).

Habit:

Amorphous - No crystalline form or imitative shape.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Silky

Streak:

white

Optical Properties of Orthochrysotile

Gladstone-Dale:

CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2133,KPDmeas= 0.2158,KC= 0.2217

Optical Data:

Biaxial (-), a=1.545-1.569, b=1.546-1.569, g=1.553-1.571, bire=0.0020-0.0080, 2V(Calc)=0-42, 2V(Meas)=20-60. Dispersion relatively weak.

Calculated Properties of Orthochrysotile

Electron Density:

r_electron=2.62 gm/cc
note: r_{Orthochrysotile}=2.59 gm/cc.

Fermion Index

Fermion Index = 0.03603
Boson Index = 0.96397

Photoelectric:

PE_{Orthochrysotile}= 1.39 barns/electron
U=PE_{Orthochrysotile} x r_electron= 3.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orthochrysotile is Not Radioactive

Orthochrysotile Classification

Dana Class:

71.1.2d.2 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.2d)Serpentine group (Chrysotile subgroup)

71.1.2d.0 Chrysotile! Mg3Si2O5(OH)4 A2/m 2/m

71.1.2d.1 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

71.1.2d.2 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

71.1.2d.3 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

71.1.2d.4 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

Strunz Class:

VIII/H.27-40 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Orthochrysotile Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Orthochrysotile

Mg3Si2O5(OH)4
Dana No: 71.1.2d.2 Strunz No: VIII/H.27-40
Locality:

Notes: