A mineral consisting of calcium fluoride that typically occurs as cubic crystals, colorless when pure but often colored by impurities.
- A greisen is a quartz - mica aggregate containing significant amounts of cassiterite, wolframite, fluorite, topaz, rutile, and tourmaline.
- Stalactite-like structures were common in the Black Sheep pocket, forming knobs and fingers of matrix covered with druzy quartz, fluorite, and galena crystals.
- Coexisting MI phases in these rocks include garnet, plagioclase, quartz, tourmaline and fluorite.
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