Geology Home Page
Roger Weller, geology instructor
Chemical Group: phosphate
Chemical Formula: Fe3(PO4)2.8H20
Color: colorless when unaltered; turns blue or green with alteration
metallic pearly on cleavage faces
Transparency: transparent when fresh; translucent when exposed to light.
Hardness: 1.5 to
Specific Gravity: 2.58 to 2.68
Special Properties: In thin pieces it is flexible; also sectile.
Cleavage: perfect cleavage (010)
Crystals are prismatic, often striated.
Mineral Associations: pyrrhotite, pyrite, copper and tin ores
Identifying Characteristics: usually altered (thus blue or green)
Lumpkin, Stewart County
Toxicity: when-swallowed- when inhaled-