igneous
Quartz-rich rock, likely milky quartz vein material
Quartz (SiO₂), possibly quartzite or quartz-bearing pegmatite
AI-generated identification · may be incorrectWhite to lavender-gray, vitreous to waxy luster, massive texture, and no obvious cleavage; quartz hardness is 7 Mohs and specific gravity is about 2.65. Brown patches likely iron-oxide staining or weathered host rock.
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Physical properties
White to lavender-gray, vitreous to waxy luster, massive texture, and no obvious cleavage; quartz hardness is 7 Mohs and specific gravity is about 2.65. Brown patches likely iron-oxide staining or weathered host rock.
Formation & geological history
Most likely formed when silica-rich hydrothermal fluids crystallized quartz in a fracture, later exposed by weathering; alternatively it may be metamorphic quartzite. Precise age and classification require a fresh surface or laboratory testing.
Uses & applications
Common quartz has uses in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces may be collected or polished, but this specimen appears primarily ornamental rather than gem quality.
Geological facts
Lavender coloration can result from trace impurities, irradiation, or surface staining, but it is not diagnostic of amethyst without clearer purple transparency and crystal form.
Field identification & locations
Look for glassy fracture, inability to scratch quartz with a steel knife, and ability to scratch ordinary glass; streak is white. Common in hydrothermal veins and quartz-rich metamorphic terrains worldwide.
