metamorphic
Rounded quartz-rich rock, possibly quartzite
Quartzite (mostly SiO₂); exact identification is uncertain from the photograph
AI-generated identification · may be incorrectCream, tan, and rusty-brown colors with a weathered, rounded surface and irregular pits. Quartz has Mohs hardness 7 and a vitreous to dull luster; the specimen’s grain and cleavage are not clear enough to confirm quartzite.
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Physical properties
Cream, tan, and rusty-brown colors with a weathered, rounded surface and irregular pits. Quartz has Mohs hardness 7 and a vitreous to dull luster; the specimen’s grain and cleavage are not clear enough to confirm quartzite.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism. Its age and source cannot be determined from the image.
Uses & applications
Quartzite is used as dimension stone, paving and construction aggregate, and sometimes as a decorative or collecting specimen.
Geological facts
Iron-oxide staining may account for the orange-brown patches; similar rounded quartz-rich rocks can also be veins or concretions rather than quartzite.
Field identification & locations
Check for interlocking quartz grains and whether the rock scratches glass; quartzite typically has no visible layering and breaks across grains. Common in metamorphic terrains worldwide.
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