mineral
Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectWhite to pale gray, opaque and glassy-to-dull with a granular crystalline texture; Mohs hardness 7, trigonal crystal structure, no cleavage and uneven fracture. The image alone cannot confirm whether minor gray material is another mineral.
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Physical properties
White to pale gray, opaque and glassy-to-dull with a granular crystalline texture; Mohs hardness 7, trigonal crystal structure, no cleavage and uneven fracture. The image alone cannot confirm whether minor gray material is another mineral.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich magma; quartz occurs in rocks of many geological ages.
Uses & applications
Used in glassmaking, ceramics, electronics, and as a common mineral specimen; this rough piece appears mainly suitable for collecting.
Geological facts
Quartz is among Earth’s most abundant minerals and scratches ordinary glass; milky opacity commonly results from microscopic fluid inclusions.
Field identification & locations
Identify by its hardness, lack of cleavage, and glassy fracture; it commonly occurs in quartz veins and granitic or metamorphic rocks worldwide. The pictured specimen is consistent with milky quartz, though a close examination or hardness test would improve identification.
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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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous