Minerals identify

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Glaucodot

Sulfide mineral

Glaucodot is a cobalt sulfide mineral with formula (Co,Fe)AsS. The cobalt:iron(II) ratio is typically 3:1 with minor nickel substituting. It forms a series with arsenopyrite (FeAsS). It is an opaque grey to tin-white typically found as massive forms without external crystal form. It crystallizes in the orthorhombic has rare twinned dipyramidal crystals (see photo). It is brittle with a Mohs hardness of 5 and a specific gravity of 5.95. It occurs in high temperature hydrothermal and chalcopyrite. Glaucodot is classed as a sulfide in the arsenopyrite group.

Glaucodot was first described in 1849 in Huasco, Valparaíso Province. Its name originates from the Greek Ancient Greek : γλανκός ("blue") in reference to its use in the dark blue glass called smalt.

Identification

Color of mineral

Grey
White
Red
Silver

Mohs scale ( mineral hardness )

5

The streak

Black

Luster ( interacts light )

Metallic

Crystal ( diaphaneity )

Orthorhombic