Explanation
Island structured sulfide minerals. The chemical formula is FeAsS. It often contains a homogeneous mixture of cobalt. In monoclinic system, crystal are mostly columnar, extending along the Z axis, and there are longitudinal lines parallel to the cylindrical surface. Aggregates are in granular or dense block shape. Tin white to steel gray, light yellow print color. Stripes are gray black, metallic luster, and opaque. The fracture is not flat.
Classification
Natural materials and products -> Mineral materials