igneous
Pegmatitic granite with lilac lepidolite and mica
Granitic pegmatite; quartz–feldspar–mica rock, possibly containing lepidolite (lithium mica)
AI-generated identification · may be incorrectCoarse, irregular interlocking crystals; white to cream feldspar and quartz with lilac mica patches and dark biotite/tourmaline-like grains. Typical hardness is about 6–7 overall, with mica near 2–3; vitreous to pearly luster and mica’s perfect basal cleavage.
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Physical properties
Coarse, irregular interlocking crystals; white to cream feldspar and quartz with lilac mica patches and dark biotite/tourmaline-like grains. Typical hardness is about 6–7 overall, with mica near 2–3; vitreous to pearly luster and mica’s perfect basal cleavage.
Formation & geological history
Formed when water-rich granitic magma slowly crystallized in a late-stage pegmatite pocket, producing unusually large crystals. Such bodies are generally Precambrian to Mesozoic, depending on locality.
Uses & applications
Commonly collected as a mineral specimen; related pegmatites supply feldspar, quartz, lithium mica, and gemstones such as tourmaline and beryl. This rough piece has little construction value.
Geological facts
The purple coloration may come from lepidolite, fluorite, or manganese-stained quartz, but the photograph cannot confirm the mineral. A streak, hardness, cleavage, and chemical or Raman test would be needed for precise identification.
Field identification & locations
Look for very coarse crystals, blocky white feldspar, glassy quartz, and flaky mica that separates into sheets; common sources include Brazil, Madagascar, Maine, California, and Colorado. Estimated value: $5–$30 for a common hand specimen, or $50–$200+ if vivid lepidolite or gem minerals are confirmed.
