metamorphic
Weathered quartz-rich metamorphic pebble
Likely quartzite or quartz-mica schist; identification is uncertain from the photograph
AI-generated identification · may be incorrectBrown, gray, and cream banding with translucent quartz-rich areas and a dull to vitreous luster; likely Mohs 6.5–7, with massive to foliated texture and no obvious cleavage. Iron-oxide staining produces the rusty brown color.
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Physical properties
Brown, gray, and cream banding with translucent quartz-rich areas and a dull to vitreous luster; likely Mohs 6.5–7, with massive to foliated texture and no obvious cleavage. Iron-oxide staining produces the rusty brown color.
Formation & geological history
Probably formed when quartz-rich sedimentary rock was metamorphosed and recrystallized during mountain-building, then rounded by stream or wave abrasion; its precise geological age and source cannot be determined visually.
Uses & applications
Mostly a natural collectible or landscaping stone; quartzite may be used as aggregate, dimension stone, and occasionally decorative material, but this small specimen has little industrial value.
Geological facts
The dark seams may be mica-rich foliation, fractures, or iron/manganese staining. A glass-scratching test and examination of a fresh surface can help distinguish quartzite from softer weathered schist.
Field identification & locations
Common in rivers, beaches, and glacial deposits derived from metamorphic terrains. Look for abundant interlocking quartz grains, lack of fizz in dilute acid, and resistance to a steel knife; a streak test is generally white.
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