Wollastonite-2M Mineral Data

Wollastonite-2M Mineral Data +

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General Wollastonite-2M Information

Chemical Formula:

CaSiO3

Composition:

Molecular Weight = 116.16 gm

Calcium 34.50 % Ca 48.28 % CaO

Silicon 24.18 % Si 51.72 % SiO₂

Oxygen 41.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaSiO₃

Environment:

Wollastonite polymorph discribed in 1935 not recognized as a separate species.

IMA Status:

Not Approved IMA 1935

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the English mineralogist and chemist, W. H. Wollaston (1766-1828).

Synonym:

Parawollastonite

Wollastonite

Wollastonite-2M Image

Images:

Wollastonite-2M

Comments: Wollastonite-2M crystals.
Location: Monte Somma (Vesuvius), Campania, Italy. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Wollastonite-2M Crystallography

Axial Ratios:

a:b:c =1.0846:1:0.9658

Cell Dimensions:

a = 7.94, b = 7.32, c = 7.07, Z = 6; alpha = 90.033°, beta = 95.367°, gamma = 103.433° V = 397.92 Den(Calc)= 2.91

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 2.97(1), 3.52(0.8), 3.83(0.8),

Physical Properties of Wollastonite-2M

Cleavage:

[100] Perfect, [102] Good, [001] Good

Color:

White, Yellow, Gray, Red, Brown.

Density:

2.8 - 2.9, Average = 2.84

Diaphaniety:

Subtransparent to translucent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5 - Apatite

Luminescence:

Fluorescent.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Wollastonite-2M

Gladstone-Dale:

CI meas= -0.074 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2198,KPDmeas= 0.2244,KC= 0.209

Optical Data:

Biaxial (-), a=1.615-1.646, b=1.627-1.659, g=1.629-1.662, bire=0.0140-0.0160, 2V(Calc)=44-50, 2V(Meas)=40. Dispersion r > v distinct.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Wollastonite-2M

Electron Density:

r_electron=2.91 gm/cc
note: r_{Wollastonite-2M}=2.91 gm/cc.

Fermion Index

Fermion Index = 0.01195
Boson Index = 0.98805

Photoelectric:

PE_{Wollastonite-2M}= 5.15 barns/electron
U=PE_{Wollastonite-2M} x r_electron= 14.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wollastonite-2M is Not Radioactive

Wollastonite-2M Classification

Dana Class:

65.2.1.1b (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.2)with chains P=3

(65.2.1)Wollastonite group

65.2.1.1a Wollastonite-1A CaSiO3 P1 1

65.2.1.1b Wollastonite-2M * CaSiO3 P 2₁ 2

65.2.1.1c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.2.1.2 Bustamite (Mn,Ca)3Si3O9 P1 1

65.2.1.3 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

65.2.1.4 Pectolite NaCa2Si3O8(OH) P1 1

65.2.1.5 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

65.2.1.6 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

65.2.1.7 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

Strunz Class:

VIII/F.18-10* VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Wollastonite-2M Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Wollastonite-2M :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -University of Colorado - Mineral Structure Data

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Print or Cut-and-Paste your Wollastonite-2M Specimen Label here :

Wollastonite-2M

CaSiO3
Dana No: 65.2.1.1b Strunz No: VIII/F.18-10*
Locality:

Notes: