mineral
Likely rough quartz-bearing mineral specimen
Quartz (silicon dioxide, SiO₂), possibly iron-stained quartz or quartz-rich rock
AI-generated identification · may be incorrectBrown to gray, irregular granular texture with a dull to vitreous luster; quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The image is too blurred for confident identification of crystal habit or associated minerals.
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Physical properties
Brown to gray, irregular granular texture with a dull to vitreous luster; quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The image is too blurred for confident identification of crystal habit or associated minerals.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or sedimentary veins; individual formation ages vary from ancient Precambrian to recent. Brown coloration commonly results from iron-oxide staining or inclusions.
Uses & applications
Quartz is used in glass, ceramics, electronics, abrasives, construction aggregate, and jewelry. This rough specimen has modest decorative or educational value.
Geological facts
Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many veins.
Field identification & locations
Test suspected quartz with a steel file or glass—quartz should scratch glass and resist a steel knife. Common localities include hydrothermal veins, pegmatites, granites, and quartz-rich sedimentary rocks worldwide.
