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Stokesite

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Sir George Gabriel Stokes
Formula:
CaSn[Si3O9] · 2H2O
System:
Orthorhombic
Colour:
Colourless, white, light ...
Hardness:
6
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.

Classification of Stokesite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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http://www.mindat.org/min-3793.html
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First Recorded Occurrence of Stokesite

Place of Conservation of First Recorded Material:
Cambridge University, England
Year of Discovery:
1899
Geological Setting of First Recorded Material:
On axinite
Associated Minerals at First Recorded Locality:

Physical Properties of Stokesite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
pearly on {100}
Colour:
Colourless, white, light blue
Streak:
White
Hardness (Mohs):
6
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {101}
imperfect on {100}
Fracture:
Conchoidal
Density:
3.185 g/cm3 (Measured)    3.211 g/cm3 (Calculated)

Crystallography of Stokesite

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

Optical Data of Stokesite

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 Stokesite

Formula:
CaSn[Si3O9] · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Stokesite to other Species

9.DM.10CalciohilairiteCaZr[SiO3]3 · 3H2O
9.DM.10HilairiteNa2Zr[SiO3]3 · 3H2O
9.DM.10KomkoviteBaZr[Si3O9] · 3H2O
9.DM.10Sazykinaite-(Y)Na5YZr[SiO3]6 · 6H2O
9.DM.10Pyatenkoite-(Y)Na5YTi[SiO3]6 · 6H2O
9.DM.15GaidonnayiteNa2Zr(Si3O9) · 2H2O
9.DM.15GeorgechaoiteNaKZr[Si3O9] · 2H2O
9.DM.20ChkaloviteNa2BeSi2O6
9.DM.25VlasoviteNa2ZrSi4O11
9.DM.30RevditeNa16Si16O27(OH)26 · 28H2O
9.DM.35ScheuchzeriteNa(Mn,Mg,Zn)9[VSi9O28(OH)](OH)3
9.DM.40TerskiteNa4ZrSi6O16 · 2H2O
14.12.1Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
14.12.2MalayaiteCaSn(SiO4)O
14.12.4PabstiteBa(Sn,Ti)(Si3O9)

Other Names for Stokesite

Name in Other Languages:
German:Stokesit
Simplified Chinese:硅钙锡石
Spanish:Stokesita
Traditional Chinese:硅鈣錫石

Other Information

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 Stokesite

Reference List:
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 Stokesite

Specimens:
The following Stokesite specimens are currently listed for sale on minfind.com.

Localities for Stokesite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Brazil
 
  • Minas Gerais
    • Doce valley
      • 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
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • South Moravia Region
      • Znojmo (Znaim)
Cech (1961) Occurrence of stokesite in Czechoslovakia. Mineralogical Magazine: 32: 673-675.
    • Vysočina 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.
      • 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
Petr Pauliš (2001): Nejzajímavější mineralogická naleziště Moravy a Slezska. Kuttna, Kutná Hora.
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
 
  • Meknès-Tafilalet 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
    • Murmanskaja 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
Collection of the Geominero Museum of Madrid; 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
    • Utö
Langhof, J., Jonson, E, Gustafsson, L. & Otter, B. (1998): Utö- en klassisk svensk mineralfyndort. Bergverksmuseets Skrift 14, 29-31
UK
 
  • England
    • Cornwall
      • St Just District
        • 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
Mineral and/or Locality  
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