Crocoite

Chemical Formula

PbCrO4

Chemical Class

Chromates

Properties

Crocoite belongs to the monoclinic system, usually presented in prismatic, thin, vertically striated crystals and in columnar aggregates. Also granular. It has adamantine gloss and 2.5 to 3 hardness.

Origin

This sample was found in Tasmania (Australia).

Curiosities

This mineral has red or orange color and light sensitivity, what can cause change in its color, if exposed for a long time to intense artificial lighting.

Use

Crocoite is considered a secondary chrome mineral, and its main use is as collection mineral. Crocoite photo credit: Henry Yu

ABC of mining