Crocoite

PbCrO4 - Mohs Hardness: 2 1/2 - 3.  Crocoite was at one time a main ore of chromium, but it is now too rare to be used. Crystals are highly sought after by mineral collectors because of their attractive color. The Adelaide Mine and the Red Lead Mine in Dundas, on the island of Tasmania, Australia, is where Crocoite is most abundant, and where the most magnificent crystals come from.
Abstract/Description: PbCrO4 - Mohs Hardness: 2 1/2 - 3. Crocoite was at one time a main ore of chromium, but it is now too rare to be used. Crystals are highly sought after by mineral collectors because of their attractive color. The Adelaide Mine and the Red Lead Mine in Dundas, on the island of Tasmania, Australia, is where Crocoite is most abundant, and where the most magnificent crystals come from.
Subject(s): Arizona, United States
environmental sciences