Stannite

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Stannite
Sulfide mineral
Cu2FeSnS4
Stn
2.CB.15a
Tetragonal
Scalenohedral (42m) H-M symbol: (4 2m)
I42m
a = 5.4432, c = 10.7299 [Å]; Z = 2
Steel-gray to iron-black, may tarnish blue
Rarely as pseudo-octahedral crystals also massive, granular, and disseminated
Penetration twins on {102}
Indistinct on {110} and {001}
Uneven
4
Metallic
Black
Opaque
4.3 – 4.5

Stannite is a mineral, a sulfide of copper, iron, and tin, in the category of thiostannates.

The chemical formula is Cu2FeSnS4. Zinc commonly occurs with the iron and trace germanium may be present. 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.

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.

• Kesterite

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