Crocoite

Formula: Pb(CrO4) chromate
Specific gravity: 5.9 - 6.0
Hardness: 2½; to 3
Streak: Orange
Colour: Red to orange
Solubility: Slightly soluble in hydrochloric, sulphuric and nitric acid
Environments:

Hydrothermal environments

Crocoite is a rare mineral found in the oxidation zone of high temperature lead deposits in those regions where lead veins have traversed rocks containing chromite. Associated with pyromorphite, cerussite and wulfenite.

Common impurities: Zn,S