mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to translucent with a glassy-to-waxy luster and irregular fracture; hardness 7 on the Mohs scale, trigonal crystal structure, and no cleavage. The small rough fragment appears consistent with quartz, though a photo cannot confirm it definitively.
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Physical properties
Typically white to translucent with a glassy-to-waxy luster and irregular fracture; hardness 7 on the Mohs scale, trigonal crystal structure, and no cleavage. The small rough fragment appears consistent with quartz, though a photo cannot confirm it definitively.
Formation & geological history
Forms when silica-rich fluids crystallize in veins or cavities, and also occurs in igneous and metamorphic rocks. Quartz is common across geologic ages.
Uses & applications
Used in glassmaking, electronics, abrasives, and as an inexpensive ornamental or jewelry material.
Geological facts
Quartz is one of Earth’s most abundant minerals; its piezoelectric behavior makes it useful in timing and electronic devices.
Field identification & locations
Look for hardness (scratches glass), lack of cleavage, and a white streak; common worldwide in veins and many rock types. The image shows a small, opaque white fragment without diagnostic crystal faces.
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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