sedimentary
Quartz-rich conglomeratic sandstone
Lithic arkose/conglomerate, dominated by quartz and feldspar grains
AI-generated identification · may be incorrectCoarse, poorly sorted clastic rock with rounded to subangular pale quartz/feldspar fragments in a sandy, iron-stained matrix; typically Mohs 6–7 for quartz grains, granular texture, dull to weakly sparkly luster, and no consistent cleavage.…
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Physical properties
Coarse, poorly sorted clastic rock with rounded to subangular pale quartz/feldspar fragments in a sandy, iron-stained matrix; typically Mohs 6–7 for quartz grains, granular texture, dull to weakly sparkly luster, and no consistent cleavage. The purple elongated object appears to be a non-geological tool or marker, not part of the specimen.
Formation & geological history
Formed when weathered sediment was transported, deposited, compacted, and cemented, likely in a river or alluvial-fan setting. Its precise geological age cannot be determined from the photograph alone.
Uses & applications
Commonly used as crushed aggregate, road base, fill, and occasionally building stone; attractive slabs may be used decoratively. It has little gemstone value.
Geological facts
The visible rounded clasts indicate transport before lithification, while rusty brown coloration commonly reflects iron-oxide cement or weathering.
Field identification & locations
Look for abundant visible grains, mixed clast sizes, gritty texture, and quartz fragments that resist scratching. Common worldwide; vinegar testing may reveal carbonate cement, while a steel nail generally will not scratch quartz-rich grains.
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