| Tennantite, (Cu,Fe)12AS4S13, (Copper Iron Arsenic Sulfide), is a relatively uncommon sulfosalt. Occasionally, however, it is an important source of Copper in some locations and is often found in with other Copper-bearing minerals. It is an end-member of a series of closely related minerals, the other end member fully substituting Arsenic by Antimony. In this form it is known as Tetrahedrite.
Description: A crystalline diorite matrix liberally studded with crystals of Tennantite. Although most show an undiferentiated massive habit, a few discrete individual tetraherdral crystals can be seen after careful examination. Interspersed with this bright silver mineral, are several areas of brassy Pyrite. The contrast between the two is quite attractive.
Location: Tomnadashan Mine, Tayside, Scotland.
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