mineral
Tumbled white quartz (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent, vitreous-to-waxy luster, and commonly massive rather than visibly crystalline. It has a trigonal crystal structure, no true cleavage, conchoidal fracture, and specific gravity around 2.65.
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Physical properties
Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, and commonly massive rather than visibly crystalline. It has a trigonal crystal structure, no true cleavage, conchoidal fracture, and specific gravity around 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; its geological age may range from ancient Precambrian to recent. The rounded shape indicates human tumbling or natural abrasion.
Uses & applications
Used as an inexpensive lapidary and decorative stone, crystal specimen, and occasional industrial silica source; it is generally not valuable jewelry material.
Geological facts
Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is one of Earth’s most abundant and durable minerals.
Field identification & locations
Identify it by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz veins and granitic terrains.
