Wollastonite-1A Mineral Data
General Wollastonite-1A 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
IMA Status:
Valid Species (Pre-IMA) 1818
Locality:
Link to MinDat.org Location Data.
Name Origin:
Named after the English mineralogist and chemist, W. H. Wollaston (1766-1828).
Name Pronunciation:
Wollastonite-1A + Pronunciation
Synonym:
Wollastonite
Wollastonite-1T
Wollastonite-1A Image
Images:
Images:
Wollastonite-1A 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:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 3.314(1), 3.83(0.85), 3.52(0.8),
Physical Properties of Wollastonite-1A
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
Luster:
Vitreous - Silky
Streak:
white
Optical Properties of Wollastonite-1A
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.
Calculated Properties of Wollastonite-1A
Electron Density:
Bulk Density (Electron Density)=2.91 gm/cc note: Specific Gravity of Wollastonite-1A =2.91 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEWollastonite-1A = 5.15 barns/electronU=PEWollastonite-1A x r Electron Density= 14.97 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Wollastonite-1A is Not Radioactive
Wollastonite-1A Classification
Dana Class:
65.02.01.01a (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-1A Information
References:
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;Dana8) OPTIC PROP.(Heinrich65)
See Also:
Links to other databases for Wollastonite-1A :
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-1A Specimen Label here :
Wollastonite-1A
CaSiO3
Dana No: 65.02.01.01a Strunz No: 09.DG.05
Locality:
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