|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | sillimanite | 6.00 | parallel | Splintery | Transparent | none | 3.20 | waxy | green | white | acicular | silicates | Often silky to figrous aggregates. Polymorph of andalusite and kyanite. |
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