sedimentary
Conglomeratic Sandstone
Clastic Sedimentary Rock
Hardness: 6-7 (Mohs scale), Color: Dark grey with reddish clasts and white quartz grains, Luster: Dull/Earthy, Structure: Granular/Clastic with visible pebbles, Cleavage: None (breaks across grains)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Dark grey with reddish clasts and white quartz grains, Luster: Dull/Earthy, Structure: Granular/Clastic with visible pebbles, Cleavage: None (breaks across grains)
Formation & geological history
Formed through the accumulation and lithification of sand, pebbles, and mineral particles in high-energy environments like riverbeds or coastal zones. Likely containing hematite or iron oxides giving it the reddish hue.
Uses & applications
Used primarily in construction as road base, concrete aggregate, and sometimes as a building stone. Collectors value specimens with unique inclusions.
Geological facts
This specimen displays a poorly sorted texture, meaning the grains and pebbles are various sizes, which indicates it was deposited quickly by water. It often serves as a reservoir for groundwater or petroleum.
Field identification & locations
Check for a gritty feel like sandpaper and the presence of rounded or sub-angular pebbles embedded in a finer matrix. Common in basin regions and along ancient river paths.
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