mineral
Milky quartz (rough quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent to milky white with a vitreous luster and irregular fracture. Trigonal crystal structure; no true cleavage. The specimen appears to be an unpolished fragment.
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Physical properties
Hardness 7 Mohs; translucent to milky white with a vitreous luster and irregular fracture. Trigonal crystal structure; no true cleavage. The specimen appears to be an unpolished fragment.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, and also occurs in igneous and metamorphic rocks. Quartz occurs across a wide range of geological ages.
Uses & applications
Used in glassmaking, electronics, and as a decorative or lapidary material; attractive pieces may be polished or cut for jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and is resistant to weathering, so it commonly accumulates in soils and sediments.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, and ability to scratch ordinary glass; common worldwide in veins, pegmatites, and many rock types.
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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
Unidentified pink-and-gray mineral or rock specimen
Undetermined; the image is too blurry for reliable identification
mineral