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Stokesite

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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 (1819-1903), 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.


Hide all sections | Show all sections

Classification of StokesiteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

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

Chemical Properties of StokesiteHide

Formula:
CaSn[Si3O9] · 2H2O
IMA Formula:
CaSnSi3O9 · 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.

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:

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:
Albite57 photos of Stokesite associated with Albite on mindat.org.
Muscovite44 photos of Stokesite associated with Muscovite on mindat.org.
Smoky Quartz36 photos of Stokesite associated with Smoky Quartz on mindat.org.
Microcline33 photos of Stokesite associated with Microcline on mindat.org.
Stannomicrolite (of Hogarth 1977)17 photos of Stokesite associated with Stannomicrolite (of Hogarth 1977) on mindat.org.
Lepidolite9 photos of Stokesite associated with Lepidolite on mindat.org.
Plumbomicrolite (of Hogarth 1977)5 photos of Stokesite associated with Plumbomicrolite (of Hogarth 1977) on mindat.org.
Cleavelandite2 photos of Stokesite associated with Cleavelandite on mindat.org.
Schorl2 photos of Stokesite associated with Schorl on mindat.org.
Quartz1 photo of Stokesite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DM.10CalciohilairiteCaZr[SiO3]3 · 3H2OTrig.
9.DM.10HilairiteNa2Zr[SiO3]3 · 3H2OTrig.
9.DM.10KomkoviteBaZr[Si3O9] · 3H2OTrig.
9.DM.10Sazykinaite-(Y)Na5YZr[SiO3]6 · 6H2O
9.DM.10Pyatenkoite-(Y)Na5YTi[SiO3]6 · 6H2OTrig.
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.40TerskiteNa4ZrSi6O16 · 2H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.12.1Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
14.12.2MalayaiteCaSn(SiO4)OMon.
14.12.4PabstiteBa(Sn,Ti)(Si3O9)Hex.

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.

References for StokesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Magazine (1960): 32: 433-435.
Cech (1961) Occurrence of stokesite in Czechoslovakia. Mineralogical Magazine: 32: 673-675.
Mineralogical Magazine (1961): 33: 615-617.
Vorma, A. (1963) The crystal structure of stokesite CaSnSi3O9.2H2O. Bull. Comm. Geol. Finland: 208: 1-48.
Cerny (1966) A new Czechoslovak occurrence of stokesite, Mineralogical magazine: 35: 835-837.
White (1973) What's new in minerals. Mineralogical Record: 4: 275-276.
Couper and Clark (1977) Mineralogical Record: 8: 294-297.
Couper and Clark (1977) Mineralogical Magazine: 41: 411-414.
Foord, Eugene E. (1977) Mineralogical Record: 8: 472-473.
Nikao et al (1977) Stokesite in the region of Ena, Gifu prefecture. Chigaku Kenkyu (Geoscience Magazine): 28: 149-152 (in Japanese).
Miyawaki et al (1987) Journal of the Mineralogical Society of Japan: 18: 17-31 (in Japanese with English abstract).
Voloshin and Pakhymovsky (1988) On the stokesite from granitic pegmatite on Kola Peninsula and in sharn from Karelia (Pitkyaranta). New data on Minerals: 9: 35: 36-39 (in Russian).

Internet Links for StokesiteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Minas Gerais
    • Galiléia
White (1973) What's new in minerals. Mineralogical record: 4: 275-276.; B. E. Prescott and K. Nassau (1978) Black Elbaite from Corrego Do Urucum, Minas Gerais, Brazil. Mineralogical Magazine 42:357-359; Atencio D, Carvalho F M S, Matioli P A (2004) Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum Mine, Galiléia, Minas Gerais, Brazil. American Mineralogist 89, 721-724
China
 
  • Inner Mongolia Autonomous Region
    • Ulanhad League (Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
Xue, Y., Li, G., Yang, G. (2017): Mineralogy and Crystallography of Stokesite From Inner Mongolia, China. Canadian Mineralogist, 55, 63-74
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • South Moravia Region
Houzar, S., Novák, M., Doležalová, H., Hrazdil, V., Pfeiferová, A.: Přehled mineralogie, petrografie a geologie nedvědických mramorů, svratecké krystalinikum. Acta Musei Moraviae, Sci. geol., 2006, roč. 91, s. 3-77.
      • Znojmo (Znaim)
Cech (1961) Occurrence of stokesite in Czechoslovakia. Mineralogical Magazine: 32: 673-675.
    • Vysočina Region
      • Třebíč District
        • Třebíč
Škoda, R. & Čopjaková, R. (2006) Herzenbergite And Sn-bearing Tinzenite From The NYF Pegmatite In Třebíč Pluton, Moldanubicum, Czech Republic. Acta Miner.-Petrograph.,Abstract Series 5, Szeged, p.107
      • Žďár nad Sázavou
        • Věžná
Cerny (1966) A new Czechoslovak occurrence of stokesite, Mineralogical Magazine: 35: 835-837; Strübel, Zimmer: "Lexikon der Minerale", 2nd Ed., 1991; Cerny, P., Hawthorne, F. C., Laflamme, J. H. G., & Hinthorne, J. (1979). Stibiobetafite, a new member of the pyrochlore group from Vezna, Czechoslovakia. Canadian Mineralogist, 17, 583-588.
Petr Pauliš (2001): Nejzajímavější mineralogická naleziště Moravy a Slezska. Kuttna, Kutná Hora.
      • Žďár nad Sázavou District
        • Bystřice nad Pernštejnem
Groat, L. A., Evans, R. J., Cempírek, J., McCammon, C., & Houzar, S. (2013). Fe-rich and As-bearing vesuvianite and wiluite from Kozlov, Czech Republic. American Mineralogist, 98(7), 1330-1337.
Japan
 
  • Honshu Island
    • Chubu Region
      • Gifu Prefecture
        • Nakatsugawa City
Miyawaki et al (1987) Journal of the Mineralogical Society of Japan: 18: 17-31 (in Japanese with English abstract).
Nikao et al (1977) Stokesite in the region of Ena, Gifu prefecture. Chigaku Kenkyu (Geoscience Magazine): 28: 149-152 (in Japanese).
Ritsuro Miyawaki et al (2004) Koubutsu-Gakkai Kou’en-Youshi, 130; Ritsuro Miyawaki, Satoshi Matsubara, Kazumi Yokoama, Akiyoshi Okamoto (2007) Hingganite-(Ce) and hingganite-(Y) from Tahara, Hirukawa-mura, Gifu Prefecture, Japan: The description on a new mineral species of the Ce-analogue of hingganite-(Y) with a refinement of the crystal structure of hingganite-(Y). Journal of Mineralogical and Petrological Sciences, 102, No. 1 February, 1-7.
Morocco
 
  • Fès-Meknès Region
    • Meknès Prefecture
      • Meknès
        • El Hammam (El Hamman)
Ph. M. Sonnet : "Burtite, Calcium Hexahydrostannate, a New Mineral from El Hamman, Central Morocco", Canadian Mineralogist, Vol. 19, 1981, pp. 397-401.
Econ Geol (1989) 84:575-590
Russia
 
  • Northern Region
    • Karelia Republic
Voloshin and Pakhymovsky (1988) On the stokesite from granitic pegmatite on Kola Peninsula and in sharn from Karelia (Piotkyaranta). New data on Minerals: 9: 35: 36-39 (in Russian).; Ivashchenko, V. I., Valkama, M., Sundblad, K., Golubev, A. I., & Alekseev, V. Y. (2011, September). New data on mineralogy and metallogeny of scarns in the Pitkyaranta ore region. In Doklady Earth Sciences (Vol. 440, No. 1, pp. 1307-1311). SP MAIK Nauka/Interperiodica; Ivashchenko, V. I., & Lavrov, О. В. (2006) Ore Deposits and Occurrences in the North Ladoga Region, Southwest Karelia. in Ore Deposits And Occurrences In The North Ladoga Region, Southwest Karelia Field Trip Guidebook. Understanding the genesis of ore deposits to meet the demands of the 21st century 12th Quadrennial IAGOD Symposium 2006. Moscow. P.41-64.
    • Murmanskaya Oblast'
Voloshin and Pakhymovsky (1988) On the stokesite from granitic pegmatite on Kola Peninsula and in sharn from Karelia (Piotkyaranta). New data on Minerals: 9: 35: 36-39 (in Russian).
Spain
 
  • Madrid
    • Valdemanco
Tanago, J. G., Lozano, P. L., Larios, A. , La Iglesia, A. (2012) Stokesite crystals from La Cabrera, Madrid, Spain. Mineralogical Record 43:499-508
Sweden
 
  • Södermanland
    • Haninge
      • Utö
Langhof, J., Jonson, E, Gustafsson, L. & Otter, B. (1998): Utö- en klassisk svensk mineralfyndort. Bergverksmuseets Skrift 14, 29-31
UK (TL)
 
  • England
    • Cornwall
      • St Just
        • Botallack
          • Cliff outcrops
Hutchinson, M.A. (1900): Mineralogical Magazine 12, 274-281
Couper, A.G., and Clark, A.M. (1977): Mineralogical Magazine 41, 411-414
      • Wendron & Falmouth District
        • Mabe
Couper, A.G., and Clark, A.M. (1977): Mineralogical Magazine 41, 411-414; Economic Geology (1980) 75, 752-759; Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
USA
 
  • California
    • San Diego Co.
      • Mesa Grande District
        • Gem Hill
Foord, Eugene E. (1977) Mineralogical Record: 8: 472-473; www.minsocam.org
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