Friday, August 20, 2010

⤱ Crocoite ⤱

Crocoite is a red to orange lead chromate, formula PB(CrO4), and occurs generally as thin prismatic interlocking crystals. The Dundas region of Tasmania is a world-famous locality for crocoite.

This specimen is coated by a number of black minerals that are apparently made up of a banded mixture of coronadite, gibbsite and manganoan hisingerite, replacing the crocoite, and comes from the Adelaide Mine, Dundas, Tasmania.