mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous luster, uneven fracture with no cleavage; Mohs hardness 7 and specific gravity about 2.65. The image shows a rough, pale massive specimen; identification is visual and not definitive.
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Physical properties
White to translucent, vitreous luster, uneven fracture with no cleavage; Mohs hardness 7 and specific gravity about 2.65. The image shows a rough, pale massive specimen; identification is visual and not definitive.
Formation & geological history
Forms when silica-rich fluids cool in veins and fractures, or during igneous and metamorphic processes. Quartz is widespread across rocks of many geological ages.
Uses & applications
Used as a silica source in glassmaking and industry; attractive pieces are collected or used in crafts and ornamental objects.
Geological facts
Quartz is one of Earth’s most abundant minerals and occurs in many varieties, including amethyst, citrine, and agate.
Field identification & locations
Look for a glassy appearance, hardness sufficient to scratch ordinary glass, and lack of cleavage. Common worldwide in veins, pegmatites, and many sedimentary and igneous rocks.
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Other mineral specimens
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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
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous