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MINERAL IDENTIFICATION PROJECT |
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Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | rutile | 6.00 | perfect | conchoidal | opaque | none | 4.30 | metallic | brown | brown | acicular | oxides | Usually as an inclusion in other minerals (see rutilated quartz). Causes the asterism in star rubies and sapphires. |
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