metamorphic
Quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂); possibly quartzite, a recrystallized quartz sandstone
AI-generated identification · may be incorrectWhite to pale gray, translucent in thin areas, with a dull-to-glassy luster and granular texture. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen’s rough texture favors quartzite over a single crystal.
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Physical properties
White to pale gray, translucent in thin areas, with a dull-to-glassy luster and granular texture. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen’s rough texture favors quartzite over a single crystal.
Formation & geological history
If quartzite, it formed when quartz sandstone was buried and metamorphosed, welding quartz grains together; ages depend on the source formation and may range from Precambrian to younger. If massive milky quartz, it precipitated from silica-rich hydrothermal fluids in fractures.
Uses & applications
Common quartzite is used as crushed stone, aggregate, landscaping material, and occasionally building stone; attractive pieces are collected or used decoratively. It is generally not gem-grade.
Geological facts
The image does not show diagnostic layering or crystal faces, so exact identification is limited. A steel knife should not scratch it, while quartz or a glass plate may scratch a steel knife.
Field identification & locations
Likely quartzite if granular and sugary; massive milky quartz if uniformly crystalline. Common worldwide, especially in quartz-vein zones and metamorphic mountain belts.
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