PHYSICAL CHARACTERISTICS:
Color is tin-white to a steel gray which can tarnish to darker grays.
Luster is metallic but the tarnish will often dull the luster.
Transparency: Crystals are opaque.
Crystal System is trigonal; bar 3 2/m
Crystal Habits include pseudocubic rhombohedral crystals. More commonly found massive, botryoidal, lamellar and radiating.
Cleavage is perfect in one direction (basal).
Fracture is uneven.
Hardness is 3 - 3.5
Specific Gravity is 6.6 - 6.7+(heavy for a metallic mineral)
Streak is tin-white to gray.
Associated Minerals include sphalerite, stibnite and nickeline.
Other Characteristics: Does not have a garlic odor.
Notable Natural Occurrences include Chihuahua, Mexico; Wolfe Co., Quebec, Canada and Kern Co., California, USA.
Best Field Indicators are density, softness, color, crystal habits, lack of smell and associations. more about please click http://www.antimonynet.com