|Mineral class||Oxides : Rutile cassiterite group.|
|Habitus|| Crystals prismatic, often striated.
Sometimes as thin needles in quartz. Also common as masses.|
Twinning in the form of harts and elbows are common.
|Cleavage||Distinct, conchoidal to uneven fracture.|
|Color|| Dark brownish to black, also red or yellow.|
Often opaque, but sometimes transparent.
|Streak||Brown to yellowish.|
|Luster||Submetallic to adamantine.|
|Occurance||In magmatic or metamorphic rocks, or in quartz veins in such rocks.|
|Associates||Commonly found with kyanite in metamorphic rocks.|
|Notes||Insoluble in most acids.|
|Locations|| A not so common mineral in Sweden.|
| To oxides index.
|| Mineral group index.
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