Occurs in Pinal County.
Chemical Formula: (Fe2+,Al,Fe3+)6(Si,Al)4O10(OH)8
Specific Gravity: 3.0-3.2
Luster: Subvitreous to pearly
Hardness: 2-2.5
Chamosite is a greenish iron aluminum silicate mineral that is a member of the chlorite group. It is often found in sedimentary rocks and can have a scaly appearance.
Next Pinal County mineral: Chlorargyrite