igneous
Quartz-bearing Pegmatite with Metallic Sulfides
Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica
Hardness: 7 (for quartz), Color: White, grey, and metallic flecks, Luster: Vitreous to metallic, Crystal Structure: Macrocrystalline / pegmatitic, Cleavage: Poor to distinct
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Physical properties
Hardness: 7 (for quartz), Color: White, grey, and metallic flecks, Luster: Vitreous to metallic, Crystal Structure: Macrocrystalline / pegmatitic, Cleavage: Poor to distinct
Formation & geological history
Formed from the slow crystallization of cooling magma deep within the Earth's crust, often late-stage crystallization rich in volatiles, dating from various geological eras.
Uses & applications
Used for mineral specimen collecting, gemstone extraction, and source material for quartz and trace metals.
Geological facts
Pegmatites are known for hosting exceptionally large crystals and rare element minerals, making them a favorite hunting ground for rockhounds.
Field identification & locations
Identify by its coarse-grained texture, glassy quartz areas, and occasional metallic specks of pyrite or mica. Commonly found in ancient mountain belts and shield regions.
