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

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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 - PinacoidalH-M Symbol ( 1) Space Group: P1 X Ray Diffraction: By Intensity(I/I_o): 3.314(1), 3.83(0.85), 3.52(0.8), Crystal Structure:

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Ohashi Y , Finger L W , American Mineralogist , 63 (1978) p.274-288, The role of octahedral cations in pyroxenoid crystal chemistry. I. Bustamite,, wollastonite, and the pectolite-schizolite-serandite series, sample Mn-WO, from Broken Hill, New South Wales, Australia View Additional jPOWD Structure files for Wollastonite-1A [1] [2] [3]

 

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: PE_{Wollastonite-1A} = 5.15 barns/electron
U=PE_{Wollastonite-1A} x rElectron 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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