mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears massive and rough, with slight iron staining or weathering.
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Physical properties
Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears massive and rough, with slight iron staining or weathering.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, and pegmatites, commonly in igneous and metamorphic rocks. Quartz is extremely old and widespread, forming throughout Earth’s geologic history.
Uses & applications
Used for glass, silicon, ceramics, abrasives, and engineered stone; attractive transparent pieces may be collected or cut as gemstones. This rough specimen has modest decorative and teaching value.
Geological facts
Its cloudy appearance results from microscopic fluid inclusions, fractures, or dispersed minerals. Quartz is piezoelectric and is one of the most abundant minerals in Earth’s continental crust.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and conchoidal fracture; avoid confusing it with calcite, which is softer and cleaves readily. Common worldwide, especially in quartz veins and granite pegmatites.
