igneous
Mica-rich pegmatitic granite
Granitic pegmatite, chiefly quartz, feldspar, and muscovite/biotite mica
AI-generated identification · may be incorrectCoarse-grained, pink to gray rock with reflective platy mica, translucent quartz, and feldspar; hardness about 6–7 overall, vitreous to pearly luster, and poor cleavage as a rock. The image may also include minor garnet or sulfide grains, but exact identification requires testing.
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Physical properties
Coarse-grained, pink to gray rock with reflective platy mica, translucent quartz, and feldspar; hardness about 6–7 overall, vitreous to pearly luster, and poor cleavage as a rock. The image may also include minor garnet or sulfide grains, but exact identification requires testing.
Formation & geological history
Forms when silica-rich magma crystallizes slowly, commonly in late-stage pegmatite veins associated with granitic intrusions. Such rocks range from Precambrian to recent geologic ages depending on the locality.
Uses & applications
Used locally as decorative stone, landscaping rock, and a source of quartz, feldspar, and mica; attractive pieces may be collected, though this specimen is not gem-grade.
Geological facts
Large crystals and glittering mica flakes are typical of pegmatitic textures. Pink coloration generally reflects potassium feldspar, while dark patches are commonly biotite or other accessory minerals.
Field identification & locations
Identify it by its interlocking coarse crystals, pink feldspar, glassy quartz, and shiny mica flakes; it is commonly found in granite terrains and pegmatite dikes worldwide. A streak, hardness, and fresh-surface examination would refine the identification.
