mineral
Milky quartz (rough specimen)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectWhite to pale greenish, cloudy and massive with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, and no cleavage (uneven fracture). The photo alone cannot confirm the identification; similar pale minerals may look alike.
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Physical properties
White to pale greenish, cloudy and massive with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, and no cleavage (uneven fracture). The photo alone cannot confirm the identification; similar pale minerals may look alike.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and fractures, or during igneous and metamorphic processes. Quartz occurs in rocks of many geological ages.
Uses & applications
Used in glassmaking, electronics, abrasives, and ornamental objects; attractive pieces may be polished or collected.
Geological facts
Quartz is one of Earth’s most abundant minerals and is a major component of many rocks.
Field identification & locations
Check for hardness near 7, lack of cleavage, and glass that it can scratch; common worldwide, especially in quartz veins and pegmatites.
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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
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
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