mineral
Milky quartz
Quartz (SiO₂), likely iron-stained or feldspar-bearing
AI-generated identification · may be incorrectHardness 7 Mohs; opaque white to peach, with a vitreous to slightly greasy luster and irregular fracture. Quartz has a trigonal crystal structure; the specimen appears massive rather than showing distinct crystals.
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Physical properties
Hardness 7 Mohs; opaque white to peach, with a vitreous to slightly greasy luster and irregular fracture. Quartz has a trigonal crystal structure; the specimen appears massive rather than showing distinct crystals.
Formation & geological history
Formed as silica-rich fluids crystallized in a vein or cavity within older rock; the image alone cannot establish its age. Peach coloring may come from iron-oxide staining or inclusions.
Uses & applications
Quartz is used in glass, electronics, and as a decorative or collecting mineral; this small rough piece has little commercial value.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs in veins cutting many rock types.
Field identification & locations
A likely identification is milky quartz; confirm with a scratch test, as it should scratch glass and resist a steel blade. It occurs 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