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Stokesite

A valid IMA mineral species - grandfathered
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About StokesiteHide

09467620014946985246359.jpg
Sir George Gabriel Stokes
Formula:
CaSn[Si3O9] · 2H2O
Colour:
Colourless, white, light blue
Lustre:
Vitreous, Pearly
Hardness:
6
Specific Gravity:
3.185
Crystal System:
Orthorhombic
Name:
Named after Sir George Gabriel Stokes (13 August 1819, Skreen, County Sligo, Ireland - 1 February 1903, Cambridge, England), mathematician and physicist, University of Cambridge (England), after whom is named Stokes's law, describing the force acting on a particle moving in a fluid medium.
This page provides mineralogical data about Stokesite.


Unique IdentifiersHide

Mindat ID:
3793
Long-form identifier:
mindat:1:1:3793:4
GUID
(UUID V4):
7993bdec-67d2-41e1-af9f-1ebd32e7e473

IMA Classification of StokesiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaSnSi3O9 · 2H2O
First published:
1899

Classification of StokesiteHide

9.DM.05

9 : SILICATES (Germanates)
D : Inosilicates
M : Inosilicates with 6-periodic single chains
65.5.1.1

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
5 : Single-Width Unbranched Chains, W=1 with chains P=6
14.12.3

14 : Silicates not Containing Aluminum
12 : Silicates of Sn

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
SksIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of StokesiteHide

Vitreous, Pearly
Transparency:
Transparent, Translucent
Comment:
pearly on {100}
Colour:
Colourless, white, light blue
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {101}
imperfect on {100}
Fracture:
Conchoidal
Density:
3.185 g/cm3 (Measured)    3.211 g/cm3 (Calculated)

Optical Data of StokesiteHide

Type:
Biaxial (+)
RI values:
nα = 1.609 nβ = 1.613 nγ = 1.619
2V:
Measured: 69° , Calculated: 66° to 70°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate

Chemistry of StokesiteHide

Mindat Formula:
CaSn[Si3O9] · 2H2O

Crystallography of StokesiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnna
Setting:
Pnna
Cell Parameters:
a = 14.465 Å, b = 11.625 Å, c = 5.235 Å
Ratio:
a:b:c = 1.244 : 1 : 0.45
Unit Cell V:
880.29 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic crystals, spherical and radial fibrous aggregates.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014440StokesiteVorma A (1963) Crystal structure of stokesite, CaSnSi3O9*2H2O Mineralogical Magazine 33 615-61719630293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.99 Å(100)
2.89 Å(100 broad)
7.25 Å(80)
1.556 Å(70)
5.82 Å(60)
4.54 Å(60)
3.55 Å(60)
Comments:
Roscommon Cliff, England.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of StokesiteHide

Place of Conservation of Type Material:
Cambridge University, England
Geological Setting of Type Material:
On axinite
Associated Minerals at Type Locality:
Reference:
Hutchinson, A. (1899) On stokesite—a new mineral from cornwall. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: 48(294): 480-481.

Other Language Names for StokesiteHide

German:Stokesit
Simplified Chinese:硅钙锡石
Spanish:Stokesita
Traditional Chinese:硅鈣錫石

Common AssociatesHide

Associated Minerals Based on Photo Data:
69 photos of Stokesite associated with AlbiteNa(AlSi3O8)
46 photos of Stokesite associated with MuscoviteKAl2(AlSi3O10)(OH)2
36 photos of Stokesite associated with Smoky QuartzSiO2
35 photos of Stokesite associated with MicroclineK(AlSi3O8)
22 photos of Stokesite associated with Stannomicrolite (of Hogarth 1977)
15 photos of Stokesite associated with Lepidolite
9 photos of Stokesite associated with Microlite GroupA2-mTa2X6-wZ-n
6 photos of Stokesite associated with Cookeite(LiAl4◻)[AlSi3O10](OH)8
5 photos of Stokesite associated with TourmalineAD3G6 (T6O18)(BO3)3X3Z
5 photos of Stokesite associated with Plumbomicrolite (of Hogarth 1977)

Related Minerals - Strunz-mindat GroupingHide

9.DM.Kesebolite-(Ce)CeCa2Mn(AsO4)(SiO3)3Mon. 2/m : P21/b
9.DM.PlumbogaidonnayitePbZrSi3O9 · 2H2OOrth. mm2
9.DM.10CalciohilairiteCaZr[SiO3]3 · 3H2OTrig. 3 2 : R3 2
9.DM.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig. 3 2 : R3 2
9.DM.10KomkoviteBaZr[Si3O9] · 3H2OTrig. 3 2 : R3 2
9.DM.10Sazykinaite-(Y)Na5YZr[SiO3]6 · 6H2OTrig. 3 2 : R3 2
9.DM.10Pyatenkoite-(Y)Na5YTi[SiO3]6 · 6H2OTrig. 3 2 : R3 2
9.DM.15GaidonnayiteNa2Zr(Si3O9) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pmna
9.DM.15GeorgechaoiteNaKZr[Si3O9] · 2H2OOrth. mm2
9.DM.20ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
9.DM.25VlasoviteNa2ZrSi4O11Mon. 2/m : B2/b
9.DM.30RevditeNa16Si16O27(OH)26 · 28H2OMon. 2 : B2
9.DM.35ScheuchzeriteNa(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3Tric. 1 : P1
9.DM.40HydroterskiteNa2ZrSi6O12(OH)6Orth. mmm (2/m 2/m 2/m)
9.DM.40TerskiteNa4ZrSi6O16 · 2H2OOrth. mm2 : Pnc2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for StokesiteHide

References for StokesiteHide

Reference List:

Localities for StokesiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Minas Gerais
    • Conselheiro Pena
China
 
  • Inner Mongolia
    • Chifeng City (Ulanhad League; Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
Czech Republic
 
  • Central Bohemian Region
    • Kutná Hora District
        • Moldanubian Zone pegmatites
          • Holý vrch deposit
  • South Moravian Region
    • Brno-Country District
    • Znojmo District
      • Ctidružice
  • Vysočina Region
    • Třebíč District
    • Žďár nad Sázavou District
      • Bystřice nad Pernštejnem
      • Věžná
Finland
 
  • Kanta-Häme
    • Forssa
Germany
 
  • Saxony
    • Erzgebirgskreis
      • Breitenbrunn
        • Breitenbrunn
      • Schwarzenberg
Japan
 
  • Gifu Prefecture
    • Nakatsugawa City
Morocco
 
  • Rabat-Salé-Kénitra Region
    • Khémisset Province
      • Khémisset Cercle
        • Ait Mimoune Caïdat
          • El Hammam
      • Oulmès Cercle
Poland
 
  • Lower Silesian Voivodeship
    • Karkonosze County
      • Szklarska Poręba
Russia
 
  • Murmansk Oblast
  • Republic of Karelia
Spain
 
  • Community of Madrid
    • Valdemanco
Sweden
 
  • Stockholm County
    • Haninge
      • Utö
UK
 
  • England
    • Cornwall
      • Mabe
      • St Just
        • Botallack
          • Cliff outcrops
USA
 
  • California
    • San Diego County
      • Mesa Grande Mining District
        • Gem Hill
Vietnam
 
  • Yên Bái Province
    • Lục Yên District
 
Mineral and/or Locality  
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