mineral
Milky quartz (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectUsually white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The cream-brown surface staining is likely iron oxides or weathering; exact identification is uncertain from the image alone.
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Physical properties
Usually white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The cream-brown surface staining is likely iron oxides or weathering; exact identification is uncertain from the image alone.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks. Quartz occurs from Precambrian rocks to modern hydrothermal deposits and is widespread geologically.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, engineered stone, electronics, and construction aggregate; attractive pieces are collected or used decoratively rather than as jewelry-grade gemstones.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical pressure.
Field identification & locations
Check whether it scratches ordinary glass but not steel, has no cleavage, and shows curved fracture surfaces; common localities include Brazil, Madagascar, the United States, and worldwide quartz veins. The specimen may also be a quartz-rich fragment such as chalcedony, which would require testing.
