mineral
Rough quartz crystal
Quartz (SiO₂), likely milky quartz
AI-generated identification · may be incorrectHardness 7 Mohs; translucent cream-white with vitreous to slightly dull luster and irregular fracture. Quartz is trigonal, has no cleavage, and specific gravity about 2.65; the image alone cannot confirm the identification.
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Physical properties
Hardness 7 Mohs; translucent cream-white with vitreous to slightly dull luster and irregular fracture. Quartz is trigonal, has no cleavage, and specific gravity about 2.65; the image alone cannot confirm the identification.
Formation & geological history
Quartz crystallizes from silica-rich fluids in veins and cavities, or forms as grains in many rocks. It occurs in rocks of many ages, from ancient crust to recent deposits.
Uses & applications
Commonly used in glassmaking, electronics, and abrasives; attractive pieces may be polished or collected.
Geological facts
Quartz is one of Earth’s most abundant minerals and can show conchoidal fracture rather than cleavage.
Field identification & locations
Look for glassy translucence, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide in veins and pegmatites. The small, fractured specimen is not diagnostic from appearance alone.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary