Stannite
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| Stannite | |
|---|---|
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| General | |
| Category | Sulfide mineral |
| Formula | Cu2FeSnS4 |
| IMA symbol | Stn[1] |
| Strunz classification | 2.CB.15a |
| Crystal system | Tetragonal |
| Crystal class | Scalenohedral (42m) H-M symbol: (4 2m) |
| Space group | I42m |
| Unit cell | a = 5.4432, c = 10.7299 [Å]; Z = 2 |
| Identification | |
| Color | Steel-gray to iron-black, may tarnish blue |
| Crystal habit | Rarely as pseudo-octahedral crystals also massive, granular, and disseminated |
| Twinning | Penetration twins on {102} |
| Cleavage | Indistinct on {110} and {001} |
| Fracture | Uneven |
| Mohs scale hardness | 4 |
| Luster | Metallic |
| Streak | Black |
| Diaphaneity | Opaque |
| Specific gravity | 4.3 – 4.5 |
| References | [2][3][4] |
Stannite is a mineral, a sulfide of copper, iron, and tin, in the category of thiostannates.
Background
The chemical formula is Cu2FeSnS4. Zinc commonly occurs with the iron and trace germanium may be present.[4] Stannite is used as an ore of tin, consisting of approximately 28% tin, 13% iron, 30% copper, 30% sulfur by mass. It is found in tin-bearing, hydrothermal vein deposits occurring with chalcopyrite, sphalerite, tetrahedrite, arsenopyrite, pyrite, cassiterite, and wolframite.[2]
It is also known as bell metal ore as tin is an important constituent of bell metal. It is thought the exploitation of tin deposits in Cornwall led to an expansion in bell founding.
The name comes from the Latin for tin: stannum. It was first described in 1797 for an occurrence in Wheal Rock, St. Agnes, Cornwall, England.[4]
See also
References
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- ^ Page Module:Citation/CS1/styles.css has no content.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.
- ^ a b Page Module:Citation/CS1/styles.css has no content."Stannite" (PDF). Handbook of Mineralogy.
- ^ Page Module:Citation/CS1/styles.css has no content."Stannite". Webmineral data.
- ^ a b c Page Module:Citation/CS1/styles.css has no content."Stannite". Mindat.org.
