|AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from England > Cassiterite (twinned crystals) on Topaz
|Cassiterite (twinned crystals) on Topaz
|St. Agnes District, Cornwall, England
|Large lustrous black cassiterite crystals to 11 mm on matrix coated with limonite-stained lustrous transparent colorless topaz crystals to 2.5 mm. The cassiterite crystals are contact twinned with well defined twin planes visible.
|For reference only
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