mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent, vitreous-to-waxy luster, usually massive rather than visibly crystalline, with conchoidal fracture and no cleavage. Dark green-brown inclusions appear to be chlorite, iron oxides, or other matrix minerals.
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Physical properties
Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, usually massive rather than visibly crystalline, with conchoidal fracture and no cleavage. Dark green-brown inclusions appear to be chlorite, iron oxides, or other matrix minerals.
Formation & geological history
Forms when silica-rich fluids fill fractures or cavities, commonly in hydrothermal veins and pegmatites; the specimen is human-tumbled and lacks a specific geological age. Quartz occurs in rocks ranging from Precambrian to recent age.
Uses & applications
Used in glass, ceramics, electronics, abrasives, countertops, and lapidary work; attractive pieces are sold as inexpensive collectible or decorative stones.
Geological facts
Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically resistant minerals.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be scratched by a steel knife. Common worldwide, especially in quartz veins, pegmatites, and metamorphic terrains.
