metamorphic
Quartz-rich rock, likely quartzite
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectCream to tan, coarse and granular with a sugary sparkle; quartz has Mohs hardness 7, vitreous luster, and no cleavage. The image alone cannot confirm whether this is quartzite or another quartz-rich rock, such as quartz vein material.
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Physical properties
Cream to tan, coarse and granular with a sugary sparkle; quartz has Mohs hardness 7, vitreous luster, and no cleavage. The image alone cannot confirm whether this is quartzite or another quartz-rich rock, such as quartz vein material.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure; its age depends on the source sandstone and metamorphic event. Quartz veins instead form when silica-rich fluids deposit quartz in fractures.
Uses & applications
Quartzite is used as decorative and dimension stone, aggregate, and sometimes landscaping rock; this rough specimen is mainly suitable for collecting.
Geological facts
Quartz grains in true quartzite are interlocked, making it very hard and resistant to weathering.
Field identification & locations
Look for a hard, quartz-rich texture and grains that resist separation; a steel tool may scratch softer minerals but should not readily scratch quartz. Similar material occurs worldwide, and the photo does not establish a precise identification or locality.
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