metamorphic
Quartz-rich rock, likely quartzite or weathered sandstone
Quartzite (mostly SiO₂); possibly quartz arenite sandstone
AI-generated identification · may be incorrectPale gray-tan, granular and weakly sparkly, with a dull to sugary vitreous luster; quartz hardness is about Mohs 7, with no cleavage. The image does not clearly show bedding, so exact identification is uncertain.
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Physical properties
Pale gray-tan, granular and weakly sparkly, with a dull to sugary vitreous luster; quartz hardness is about Mohs 7, with no cleavage. The image does not clearly show bedding, so exact identification is uncertain.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized during metamorphism, welding grains into a hard mosaic; sandstone forms by cementation of sand. Ages range from ancient Precambrian to modern sedimentary units.
Uses & applications
Quartzite is used as crushed stone, aggregate, building stone, and occasionally as a decorative slab; attractive pieces may be collected but are generally low-value.
Geological facts
A steel knife should not scratch quartzite, while quartz-rich sandstone may shed grains or show bedding. Fresh broken surfaces commonly reveal interlocking quartz grains and abundant sparkle.
Field identification & locations
Common in metamorphic mountain belts and quartz-rich sedimentary formations worldwide, including the Appalachians, Rocky Mountains, and many shield regions. Field confirmation requires testing hardness, checking for bedding, and examining grains with a hand lens.
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