igneous
Quartz-rich pegmatite with green epidote or chlorite
Pegmatitic quartz–feldspar rock, likely containing epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH)) and/or chlorite
AI-generated identification · may be incorrectCoarse interlocking crystals with translucent white quartz, cream feldspar, and pale green alteration minerals; vitreous to pearly luster, irregular fracture, and hardness roughly 6–7 (quartz) or 6 (feldspar). Exact identification is limited by the photograph.
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Physical properties
Coarse interlocking crystals with translucent white quartz, cream feldspar, and pale green alteration minerals; vitreous to pearly luster, irregular fracture, and hardness roughly 6–7 (quartz) or 6 (feldspar). Exact identification is limited by the photograph.
Formation & geological history
Likely a late-stage granitic pegmatite formed when silica-rich magma cooled slowly in a fracture, allowing exceptionally large crystals; commonly Precambrian to Phanerozoic, depending on locality.
Uses & applications
Primarily a collector specimen; quartz and feldspar pegmatites are also sources of industrial feldspar, quartz, mica, lithium, and rare-metal minerals, though this piece has little commercial value.
Geological facts
The green material may be epidote, chlorite, or altered amphibole; a streak, hardness test, and close inspection of crystal shape would distinguish them.
Field identification & locations
Common in granitic terrains, especially pockets and veins in metamorphic or igneous regions. Look for coarse crystals, glassy quartz, blocky feldspar, and green alteration minerals.
