sedimentary
Weathered sandstone pebble
Quartz-rich sandstone, likely ferruginous or arkosic sandstone
AI-generated identification · may be incorrectFine-grained, rounded pebble with tan, brown, and purplish weathering colors; dull to earthy luster and no obvious crystals or cleavage. Typical hardness is about 6–7 Mohs, with moderate porosity and a specific gravity near 2.2–2.7.
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Physical properties
Fine-grained, rounded pebble with tan, brown, and purplish weathering colors; dull to earthy luster and no obvious crystals or cleavage. Typical hardness is about 6–7 Mohs, with moderate porosity and a specific gravity near 2.2–2.7.
Formation & geological history
Formed when sand grains—mostly quartz with possible feldspar and iron-oxide cement—were compacted and cemented, then rounded by erosion and transport. Its exact geological age cannot be determined from the photograph.
Uses & applications
Used locally as aggregate, building stone, landscaping material, and decorative cobbles; this individual specimen has little commercial value.
Geological facts
The dark brown-purple coloration likely reflects iron-oxide or manganese staining and surface weathering rather than a separate mineral band.
Field identification & locations
Common in streambeds, beaches, glacial deposits, and sedimentary outcrops; identify by gritty texture, sand-sized grains, and a lack of visible interlocking crystals. A hand lens and streak/acid tests would improve identification.
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