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Crystal system |
hexagonal. |
Habit |
tabular, granular, stalactitic or prismatic; rhombohedral or scalenohedral in geometric form. |
Cleavage |
perfect. |
Fracture |
rarely present but is conchoidal (long curved surface pattern often seen when glass breaks). |
Hardness |
3 |
Specific Gravity |
2.7 |
Color |
can be colorless, opaque, white, gray, yellow, green, purple, blue/brown or black. |
Luster |
transparent to translucent with a vitreous or pearly luster |
Streak |
white. |
Distinguishing features |
dissolves easily in cold, hydrochloric acid. |
Uses |
used in petrological microscopes as a polarizing prism; also used in cements for buildings, as a flux in metallurgy, in soil enrichment and as fillers in rubber and paint.
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