mineral
Milky quartz
Quartz (SiO₂)
AI-generated identification · may be incorrectLikely a rough, translucent white quartz mass with a vitreous-to-greasy luster and irregular fracture. Mohs hardness 7; trigonal crystal structure, no cleavage; specific gravity about 2.65.
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Physical properties
Likely a rough, translucent white quartz mass with a vitreous-to-greasy luster and irregular fracture. Mohs hardness 7; trigonal crystal structure, no cleavage; specific gravity about 2.65.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich igneous rocks. Quartz occurs in rocks of many geological ages.
Uses & applications
Commonly used for ornaments, carvings, and decorative stone; quartz is also an important industrial source of silica, though this specimen appears to be a small rough piece.
Geological facts
Milky appearance comes from microscopic fluid or gas inclusions that scatter light.
Field identification & locations
Identify by its glassy sheen, hardness (it can scratch glass), and lack of cleavage. Common worldwide in quartz veins and pegmatites; the photo alone cannot establish the exact identification.
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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