Color is usually silver-white. Luster is metallic. Diaphaneity is opaque.
Fracture is uneven.
Hardness is 5.5 - 6. Streak is black. Associated Minerals include albite, amphiboles, apophyllite series, berthierine, biotite, calcite, epidote, fluorapatite, fluorite, gaidonnayite, galena, garnet group, molybdenite, pectolite, pyrite, pyrrhotite, rutile, siderite, sphalerite, titanite, vesuvianite and zircon.