mineral
Milky quartz (possibly quartz-rich pegmatite)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to translucent, vitreous-to-greasy luster, and a granular/massive crystal structure; it lacks cleavage and breaks with conchoidal fracture. The specimen appears coated or mixed with fine feldspar/mica, so exact identification from an image is tentative.
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Physical properties
Typically Mohs hardness 7, white to translucent, vitreous-to-greasy luster, and a granular/massive crystal structure; it lacks cleavage and breaks with conchoidal fracture. The specimen appears coated or mixed with fine feldspar/mica, so exact identification from an image is tentative.
Formation & geological history
Forms when silica-rich fluids or magma crystallize in veins and granitic pegmatites, commonly during Precambrian to younger continental-crust events. Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities.
Uses & applications
Used for glass, ceramics, engineered stone, abrasives, and electronics; attractive translucent pieces are sold as cabinet or lapidary specimens. This rough example has limited commercial value.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Milky quartz commonly occurs with feldspar, mica, tourmaline, and other pegmatite minerals.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, no cleavage, and conchoidal fracture; a streak test is white. Common localities include granite terrains, hydrothermal veins, and pegmatites worldwide.
