mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically Mohs hardness 7, vitreous-to-waxy luster, white to translucent appearance, and a hexagonal crystal structure; the rounded shape indicates tumbling and does not show cleavage. Specific gravity is about 2.65.
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Physical properties
Typically Mohs hardness 7, vitreous-to-waxy luster, white to translucent appearance, and a hexagonal crystal structure; the rounded shape indicates tumbling and does not show cleavage. Specific gravity is about 2.65.
Formation & geological history
Quartz crystallizes from silica-rich igneous and hydrothermal fluids and is also common in metamorphic veins and sedimentary rocks; individual crystals may range from Precambrian to recent. The specimen has been mechanically polished.
Uses & applications
Used in glass, ceramics, electronics, abrasives, countertops, and lapidary objects; attractive pieces are sold as inexpensive décor or collecting specimens.
Geological facts
Milky color results from microscopic fluid inclusions, fractures, or defects that scatter light. Quartz is one of Earth’s most abundant and chemically resistant minerals.
Field identification & locations
Identify it by its glassy/waxy luster, lack of visible cleavage, hardness sufficient to scratch ordinary glass, and white translucent body; common worldwide, especially in quartz veins and pegmatites.
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Epidote
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Granite
Granite (Phaneritic intrusive igneous rock)
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