mineral
Milky quartz pebble
Quartz (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent with a vitreous-to-greasy luster and irregular fracture, lacking cleavage. The small, rounded specimen appears to contain brown surface staining or inclusions; crystal structure is trigonal.
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Physical properties
Hardness 7 Mohs; white to translucent with a vitreous-to-greasy luster and irregular fracture, lacking cleavage. The small, rounded specimen appears to contain brown surface staining or inclusions; crystal structure is trigonal.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma and is highly resistant to weathering, so it commonly accumulates as rounded stream or beach pebbles. Its age and original geological setting cannot be determined from the image.
Uses & applications
Quartz is widely used in glassmaking, electronics, and abrasives; attractive pieces are collected or used in simple jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and ranks 7 on the Mohs hardness scale.
Field identification & locations
Look for hardness sufficient to scratch glass, no cleavage, and a glassy luster; common in veins, granites, and river gravels worldwide. The specimen’s brown areas may be iron-oxide staining.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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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