mineral
Quartz (Pegmatitic Quartz with Feldspar)
SiO2 (Silicon Dioxide)
Hardness 7 on the Mohs scale, vitreous to greasy luster, color ranges from off-white to pale pinkish-tan with minor dark inclusions, conchoidal fracture, lacks cleavage.
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Physical properties
Hardness 7 on the Mohs scale, vitreous to greasy luster, color ranges from off-white to pale pinkish-tan with minor dark inclusions, conchoidal fracture, lacks cleavage.
Formation & geological history
Formed in intrusive igneous environments, particularly pegmatites, during the late stages of magma crystallization where coarse-grained quartz and feldspar grow together.
Uses & applications
Used extensively as raw material in glass manufacturing, electronics, as crushed stone/aggregate, and as decorative specimen for lapidary collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Coarse-grained pegmatite quartz specimens often host minor inclusions of black tourmaline, mica, or iron oxides.
Field identification & locations
Identified in the field by its scratch resistance (scratches glass, cannot be scratched by a steel nail), lack of distinct cleavage, and glassy appearance on freshly broken surfaces. Found worldwide in igneous terrain.
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Mineral/Rock