igneous
Weathered quartz-rich pebble
Likely quartz-rich granitoid (quartz and feldspar); exact identification is uncertain from the image
AI-generated identification · may be incorrectPale cream to white, rough and granular with a dull to slightly vitreous luster. Quartz is Mohs 7; feldspar is about 6; individual grains are crystalline, but the specimen’s texture and cleavage are not clear enough to confirm its rock type.
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Physical properties
Pale cream to white, rough and granular with a dull to slightly vitreous luster. Quartz is Mohs 7; feldspar is about 6; individual grains are crystalline, but the specimen’s texture and cleavage are not clear enough to confirm its rock type.
Formation & geological history
Could be a fragment of granite or another quartz-rich rock, weathered from an older intrusive igneous body and rounded by transport. Its geological age and source cannot be determined from the image.
Uses & applications
Common material of this kind is used as aggregate, landscaping stone, and sometimes building stone; this small pebble has little commercial value.
Geological facts
Quartz-rich granitoid pebbles are common in mixed gravel, where transport and weathering wear down their original angular edges.
Field identification & locations
A pale color and visible grains suggest quartz and feldspar, but a fresh break or closer view is needed to distinguish granitoid from quartzite or another rock. Such pebbles occur in river, beach, and landscaping gravel worldwide.
