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Definition of druse

i. An irregular cavity or opening in a vein or rock, having its interior surface or walls lined (encrusted) with small projecting crystals usually of the same minerals as those of the enclosing rock, and sometimes filled with water; e.g., a small solution cavity, a steam hole in lava, or a lithophysa in volcanic glass.

Compare with: Geode, miarolitic cavity, vug

Ref: AGI

ii. A mineral surface covered with small projecting crystals; specif. the crust or coating of crystals lining a druse in a rock, such as sparry calcite filling pore spaces in a limestone. Etymol: German. Adj: drusy.

Ref: AGI

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