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Crystal description - Usually as either smooth, rounded crystals showing basic trapezohedral forms, sometimes modified by the dodecohedron or as highly altered "klinkers" made up basically of a garnet core with a black or red rind of hematite, topaz and quartz. In size, most are under 1/2 inch, but may be up to 2 inches in diameter. May form in single crystals or in clusters of two ore more crystals.
Physical properties - Color -- red to dark brown
Luster - glassy
Hardness - 6-7 1/2
Specific Gravity - 3.5
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