metamorphic
Weathered quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if recrystallized sandstone
AI-generated identification · may be incorrectWhite to pale lavender, opaque to translucent, with dull-to-glassy luster and irregular fracture; quartz hardness is Mohs 7, with no cleavage and specific gravity about 2.65. The rounded, smoothed surface suggests natural weathering or tumbling.
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Physical properties
White to pale lavender, opaque to translucent, with dull-to-glassy luster and irregular fracture; quartz hardness is Mohs 7, with no cleavage and specific gravity about 2.65. The rounded, smoothed surface suggests natural weathering or tumbling.
Formation & geological history
Quartz veins crystallize from silica-rich hydrothermal fluids, while quartzite forms when sandstone is metamorphosed and recrystallized. The specimen’s exact age and formation cannot be determined from the photograph.
Uses & applications
Common quartz and quartzite are used as aggregate, abrasives, silica feedstock, and decorative stone; attractive pieces may be sold as display specimens, though this example appears modestly gemologically valuable.
Geological facts
Pale lavender coloration can result from trace impurities, irradiation, or surface lighting; it is not diagnostic of amethyst because no distinct purple transparent crystals are visible.
Field identification & locations
Look for glassy fracture, hardness sufficient to scratch ordinary glass, and lack of cleavage; a steel knife should not scratch it. Common worldwide in quartz veins, metamorphic terrains, and stream gravels.
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