Wollastonite-2M Mineral Data

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).

Name Pronunciation:

Wollastonite-2M + Pronunciation

Synonym:

Manganoparawollastonite - Mn-bearing wollastonite

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),

Crystal Structure:

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Trojer F J , Zeitschrift fur Kristallographie , 127 (1968) p.291-308, The crystal structure of parawollastonite, Locality: Crestmore, California, USA

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

Diaphaneity:

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:

Non-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
Ncalc = 1.59 - 1.61

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:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Wollastonite-2M =2.91 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wollastonite-2M is Not Radioactive

Wollastonite-2M Classification

Dana Class:

65.02.01.01b (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.02)with chains P=3

(65.02.01)Wollastonite group

65.02.01.01a Wollastonite-1A CaSiO3 P1 1

65.02.01.01b Wollastonite-2M* CaSiO3 P 2₁ 2

65.02.01.01c Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

65.02.01.02 Bustamite (Mn,Ca)3Si3O9 P1 1

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

65.02.01.04 Pectolite NaCa2Si3O8(OH) P1 1

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

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

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

65.02.01.08 Tanohataite! LiMn2Si3O8(OH) P1 1

Strunz Class:

09.DG.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.05 Bustamite (Mn,Ca)3Si3O9 P1 1

09.DG.05 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

09.DG.05 Pectolite NaCa2Si3O8(OH) P1 1

09.DG.05 Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

09.DG.05 Wollastonite-1A CaSiO3 P1 1

09.DG.05 Wollastonite-2M* CaSiO3 P 2₁ 2

09.DG.05 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - 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: 65.02.01.01b Strunz No: 09.DG.05
Locality:

Notes: