mineral
White quartz-rich rock, possibly milky quartz
Quartz (SiO₂), possibly quartzite or calcite-bearing material
AI-generated identification · may be incorrectWhite, opaque, and granular to massive with a dull-to-vitreous luster; quartz hardness is Mohs 7, no cleavage, and specific gravity about 2.65. The image alone cannot distinguish quartz from white calcite, feldspar, or a weathered quartzite.
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Physical properties
White, opaque, and granular to massive with a dull-to-vitreous luster; quartz hardness is Mohs 7, no cleavage, and specific gravity about 2.65. The image alone cannot distinguish quartz from white calcite, feldspar, or a weathered quartzite.
Formation & geological history
Quartz forms in igneous, hydrothermal, and metamorphic environments; quartzite forms when sandstone recrystallizes during metamorphism. Geological age depends on its source and cannot be determined visually.
Uses & applications
Used for glass, silica, ceramics, abrasives, countertops, and construction aggregate; attractive pieces may be collected, though this specimen appears low grade.
Geological facts
Quartz commonly shows conchoidal fracture and scratches ordinary steel or glass; calcite fizzes in dilute hydrochloric acid and is much softer (Mohs 3).
Field identification & locations
Test cautiously: inspect for glassy fracture, try scratching glass, and apply vinegar or dilute acid to a fresh spot for possible calcite reaction. Common worldwide, especially in quartz veins and quartzite terrains.
