mineral
Milky quartz (likely rose/milky quartz)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; translucent white to pale pink, vitreous to waxy luster, hexagonal crystal structure, and no cleavage with uneven conchoidal fracture. The rounded surface suggests natural abrasion or tumbling.
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Physical properties
Hardness 7 Mohs; translucent white to pale pink, vitreous to waxy luster, hexagonal crystal structure, and no cleavage with uneven conchoidal fracture. The rounded surface suggests natural abrasion or tumbling.
Formation & geological history
Forms when silica-rich fluids crystallize in igneous and metamorphic rocks, commonly in veins and pegmatites. Quartz is widespread from Precambrian terrains to modern hydrothermal systems.
Uses & applications
Used for countertops, glass, ceramics, abrasives, electronics, and ornamental carvings; attractive transparent pieces may be used as cabochons, though this specimen appears mainly a common collecting material.
Geological facts
Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities. It can scratch ordinary glass and steel but should not be confused with calcite, which is much softer.
Field identification & locations
Common in quartz veins, granite, pegmatite, and stream gravels worldwide, especially Brazil, Madagascar, the United States, and the Alps. A glass-scratch test, lack of cleavage, and conchoidal fracture support quartz identification.
