mineral
Milky quartz (vein quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectWhite to cream, massive and opaque with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, no cleavage, and conchoidal fracture. The rusty streaks are likely iron-oxide staining.
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Physical properties
White to cream, massive and opaque with a vitreous-to-waxy luster; Mohs hardness 7, trigonal crystal structure, no cleavage, and conchoidal fracture. The rusty streaks are likely iron-oxide staining.
Formation & geological history
Formed when silica-rich fluids filled fractures and crystallized, commonly during late stages of igneous or metamorphic activity; its precise age and source cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and decorative stone; attractive pieces may be collected or polished.
Geological facts
Quartz is one of Earth’s most abundant minerals and occurs in many rock types and hydrothermal veins.
Field identification & locations
Look for a hard, pale, glassy-to-waxy mass that scratches glass and breaks with curved fracture surfaces; common worldwide in veins and pegmatites. This specimen’s plain, irregular appearance suggests modest display value.
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Sandstone (with potential mineral staining/concretions)
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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