igneous
Pegmatitic pink feldspar–quartz rock
Granitic pegmatite; chiefly microcline/orthoclase feldspar (KAlSi₃O₈), quartz (SiO₂), and minor mica
AI-generated identification · may be incorrectCoarse interlocking crystals, predominantly salmon-pink and white with glassy to pearly luster; feldspar hardness ~6, quartz 7, uneven fracture, and feldspar cleavage. The large crystal size and translucent quartz patches are typical of pegmatite.
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Physical properties
Coarse interlocking crystals, predominantly salmon-pink and white with glassy to pearly luster; feldspar hardness ~6, quartz 7, uneven fracture, and feldspar cleavage. The large crystal size and translucent quartz patches are typical of pegmatite.
Formation & geological history
Formed when water-rich granitic magma cooled slowly in veins and pockets, allowing exceptionally large crystals to grow, generally during Precambrian to Phanerozoic mountain-building events.
Uses & applications
Used as an ornamental and landscaping stone, feldspar source for ceramics and glass, and as a collector specimen; associated pegmatites may host tourmaline, beryl, or lithium minerals.
Geological facts
Pegmatites are among the best natural environments for giant crystals and rare-element minerals. Pink color commonly reflects potassium feldspar, sometimes enhanced by minor iron staining.
Field identification & locations
Identify by very coarse grain size, pink cleavable feldspar, gray-clear quartz, and possible black mica. Common worldwide in granitic terrains, including Brazil, Madagascar, the United States, and Scandinavia.
