Stannoidite
Silvery stannoidite crystals from the Akenobe Mine, Yabu City, Honshu Island, Japan, associated with chalcopyrite
General
CategorySulfide mineral
Formula
(repeating unit)
Cu6+Cu22+(Fe2+,Zn)3Sn2S12
IMA symbolSta[1]
Strunz classification2.CB.15c
Crystal systemOrthorhombic
Crystal classDisphenoidal (222)
H-M symbol: (2 2 2)
Space groupI222 (No. 23)
Unit cella = 10.76 Å, b = 5.4 Å
c = 16.09 Å, Z = 2
Identification
ColorBrass brown
Crystal habitUniformly indistinguishable crystals forming large masses
CleavageNone
FractureConchoidal – uneven
Mohs scale hardness4
LusterMetallic
StreakBrown gray
DiaphaneityOpaque
Specific gravity4.29
References[2][3][4]

Stannoidite is a sulfide mineral composed of five chemical elements: copper, iron, zinc, tin and sulfur. Its name originates from Latin stannum (tin) and Greek eides (or Latin oïda meaning "like"). The mineral is found in hydrothermal Cu-Sn deposits.[2][3]

Stannoidite was first described in 1969 for an occurrence in the Konjo mine, Okayama prefecture, Honshu Island, Japan.[3]

See also

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. 1 2 Stannoidite. Webmineral
  3. 1 2 3 Stannoidite. Mindat.org
  4. Kudoh Y., Takeuchi Y. (1976). "The superstructure of stannoidite". Zeitschrift für Kristallographie – Crystalline Materials. 144 (1–6): 145–160. Bibcode:1976ZK....144..145K. doi:10.1524/zkri.1976.144.16.145. S2CID 201808201.


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