igneous
Pegmatite with Tourmaline
Igneous Pegmatite (Quartz-Feldspar matrix with Schorl Tourmaline)
AI-generated identification · may be incorrectHardness of 7 for quartz, vitreous luster, uneven fracture, and massive crystal habit with embedded prismatic tourmaline crystals.
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Physical properties
Hardness of 7 for quartz, vitreous luster, uneven fracture, and massive crystal habit with embedded prismatic tourmaline crystals.
Formation & geological history
Formed from the slow cooling of water-rich magma deep within the Earth's crust during the late stages of crystallization.
Uses & applications
Used as a source of rare-element minerals, gemstone specimens, and for mineral collecting.
Geological facts
Pegmatites are known for growing exceptionally large crystals due to the high fluid content in the cooling magma.
Field identification & locations
Identify by coarse-grained interlocking crystals of quartz and feldspar, often containing dark acicular tourmaline needles.
