mineral
Tumbled 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 rounded shape indicates human tumbling or natural abrasion.
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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 rounded shape indicates human tumbling or natural abrasion.
Formation & geological history
Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal environments; milky appearance results from microscopic fluid inclusions or structural defects. Quartz is common from Precambrian to modern geological settings.
Uses & applications
Used as a decorative and lapidary stone, in carvings, countertops, abrasives, glass, ceramics, and electronics. This specimen has modest ornamental and collecting value.
Geological facts
Quartz is among Earth’s most abundant minerals and is piezoelectric, generating an electrical charge when mechanically stressed.
Field identification & locations
Identify by its glassy translucence, lack of cleavage, hardness sufficient to scratch ordinary glass, and conchoidal fracture; common worldwide, especially in granite pegmatites, veins, and metamorphic rocks.
