mineral
Milky quartz
Quartz (SiO₂), commonly called milky quartz
AI-generated identification · may be incorrectWhite, translucent to opaque fragment with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, and no cleavage, breaking with uneven or conchoidal fracture. The fragment appears roughly centimeter-scale beside the coin.
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Physical properties
White, translucent to opaque fragment with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, and no cleavage, breaking with uneven or conchoidal fracture. The fragment appears roughly centimeter-scale beside the coin.
Formation & geological history
Forms when silica-rich fluids crystallize in veins or cavities, or as part of igneous and metamorphic rocks. Quartz is widespread across Earth’s crust and occurs in rocks of many geological ages.
Uses & applications
Used as a silica source in glassmaking and industrial materials; attractive pieces are collected or used in decorative stonework and jewelry.
Geological facts
Its cloudy appearance results from microscopic fluid inclusions or defects that scatter light.
Field identification & locations
Likely identification is milky quartz, but a photograph cannot confirm composition. Look for glassy surfaces, hardness sufficient to scratch glass, and lack of cleavage; common worldwide, especially in quartz veins.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary