Mineralogy Database

Stokesite Mineral Data

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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 Environment: Environment: On axinite (Roscommon Cliff, England); in miarolitic cavities in a quartz-albite pegmatite (Vezna, Czech Republic).
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 Name Origin: Name Origin: Named for Sir George Gabriel Stokes (1819-1903), professor of Mathematics, Cambridge University, Cambridge, England.
Help on Name Pronunciation: Name Pronunciation: Stokesite + Pronunciation Say STOKESITE
Help on Synonym: Synonym: ICSD 34348
  PDF 13-109

Stokesite Image

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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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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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  Stannomicrolite   Stokesite

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 - Dipyramidal H-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),

Physical Properties of Stokesite

Help on Cleavage: Cleavage: {???} Good, {???} Good
Help on Color: Color: Colorless.
Help on Density: Density: 3.2
Help on Diaphaneity: Diaphaneity: 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
Ncalc = 1.61
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: Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Stokesite =3.21 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEStokesite = 82.15 barns/electron
U=PEStokesite x rElectron Density= 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)Inosilicate Single-Width Unbranched Chains, W=1
  (65.05)with chains P=6
  (65.05.01)Dana Group Stokesite CaSnSi3O9•2(H2O) Pnna 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DM.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DM -Inosilicates with 6-periodic single chains
09.DM.05 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.DM.05





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