Mineral description : Tennantite

Tennantite from Boliden, Sweden.

Mineral class	Sulphides : Tetrahedrite - Bournonite - Boulangerite group.
Chemical formula	Cu12As4S13
Crystal system	Cubic.
Habitus	Tetraedric crystals. More commonly as grainy masses.
Cleavage	None, uneven to subconchoidal fracture.
Hardness	3-4.5
Density	4.5-5.2
Color	Black to gray.
Streak	Dark gray.
Luster	Metallic, matte.
Description
Occurance	In hydrothermal veins and pegmatites.
Associates
Notes	Tetrahedrite and tennantite creates a continuous serie under the common name fahlerts. Soluble in nitric acid. Fuses easily.
Locations	Relatively rare in Sweden but a few localities exists. Håkansboda. Found during new mining tests. Falu mine. As a rarity.

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