mineral
Tumbled milky quartz
Quartz, SiO₂
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent gray with brown iron-oxide staining, vitreous-to-waxy luster, and no visible cleavage. Trigonal crystal structure; the rounded, rectangular form indicates tumbling or cutting.
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Physical properties
Hardness 7 Mohs; white to translucent gray with brown iron-oxide staining, vitreous-to-waxy luster, and no visible cleavage. Trigonal crystal structure; the rounded, rectangular form indicates tumbling or cutting.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic veins; its exact geological age and source cannot be determined from the image. Brown coloration is likely surface or fracture staining by iron oxides.
Uses & applications
Common as a low-cost lapidary, teaching, and collectible specimen; polished quartz is also used ornamentally and industrially in glass, ceramics, abrasives, and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and is resistant to weathering, making it common in sediments and veins.
Field identification & locations
Identify by its glassy/waxy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and typically white translucent body. Common worldwide, especially in quartz veins and pegmatites.
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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