Stokesite Mineral Data + Say STOKESITE


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General Stokesite Information

Help on Chemical  Formula: Chemical Formula: CaSnSi3O9·2(H2O)
Help on Composition: Composition: Molecular Weight = 423.07 gm
   Calcium    9.47 %  Ca   13.25 % CaO
   Silicon   19.92 %  Si   42.61 % SiO2
   Tin       28.06 %  Sn   31.84 % SnO
   Hydrogen   0.95 %  H     8.52 % H2O
   Oxygen    41.60 %  O
            ______        ______ 
            100.00 %       96.22 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaSnSi3O9·2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1899
Help on Locality: Locality: Roscommon Cliff, St. Just, Cornwall, England. Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 34348
  PDF 13-109
 

Stokesite Image

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Stokesite

Comments: Colorless transparent stokesite microcrystal in albite.
Location: Corrego do Urucum, Galileia, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Stokesite

Comments: Thick, tabular crystals of stokesite, perched atop a 2 cm sphere of feldspar crystals.
Location: Corrego do Urucum, near Galilea, Minas Gerais, Brazil. Scale: 3.3 x 2.5 x 2 cm.
© Rob Lavinsky

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Stokesite   Stannomicrolite

Comments: Stokesite "ball" composed of lath-like tan or clear crystals with several micro crystals of yellow stannomicrolite.
Location: Urucum mine, Galileia, Minas Gerais, Brazil. Scale: 1.2 cm.
© Tom Loomis / Dakota Matrix

Stokesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2411:1:0.4504
Help on Cell Dimensions: Cell Dimensions: a = 14.41, b = 11.61, c = 5.23, Z = 4; V = 874.98 Den(Calc)= 3.21
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnna
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.89(1), 3.99(1), 7.25(0.8),
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Vorma A , Mineralogical Magazine , 33 (1963) p.615-617, Crystal structure of stokesite, CaSnSi3O9*2H2O

 

Physical Properties of Stokesite

Help on Cleavage: Cleavage: [???] Good, [???] Good
Help on Color: Color: Colorless.
Help on Density: Density: 3.2
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Stokesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1912,KPDmeas= 0.1918,KC= 0.19
Help on Optical Data: Optical Data: Biaxial (+), a=1.609, b=1.613, g=1.619, bire=0.0100, 2V(Calc)=80, 2V(Meas)=69.5.
 

Calculated Properties of Stokesite

Help on Electron Density: Electron Density:

relectron=3.10 gm/cc
note: rStokesite =3.21 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.05626
Boson Index = 0.94374
Help on Photoelectric: Photoelectric:

PEStokesite = 82.15 barns/electron
U=PEStokesite x relectron= 254.32 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stokesite is Not Radioactive

 

Stokesite Classification

Help on  Dana Class: Dana Class: 65.5.1.1 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.5)with chains P=6
  (65.5.1)Dana Group
 
65.5.1.1 Stokesite CaSnSi3O9·2(H2O) Pnna 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/F.29-30 VIII - Silicates
  VIII/F - Inosilicates (chain and band) Six chains [Si6O18]12- and six bands [Si12O30]12-
  VIII/F.29 - Hilairite - Stokesite series
 
VIII/F.29-10 Hilairite Na2ZrSi3O9·3(H2O) R 3m 3 2/m
 
VIII/F.29-20 Calciohilairite CaZrSi3O9·3(H2O) R 32 3 2
 
VIII/F.29-24 Pyatenkoite-(Y)! Na5(Y,Dy,Gd)TiSi6O18·6(H2O) R 32 3 2
 
VIII/F.29-25 Sazykinaite-(Y) Na5YZrSi6018·6(H2O) R 32 3 2
 
VIII/F.29-30 Stokesite CaSnSi3O9·2(H2O) Pnna 2/m 2/m 2/m
 

Other Stokesite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Stokesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Stokesite

CaSnSi3O9·2(H2O)
Dana No: 65.5.1.1 Strunz No: VIII/F.29-30
Locality:

 

Notes:

 

 
   
 
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