Home > Term: greisen
greisen
A pneumatolytically altered granitic rock composed largely of quartz, mica, and topaz. The mica is usually muscovite or lepidolite. Tourmaline, fluorite, rutile, cassiterite, and wolframite are common accessory minerals.
- Part of Speech: noun
- Industry/Domain: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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Creator
- ed.young
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(Milwaukee, United States)