sedimentary
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
AI-generated identification · may be incorrectHardness: 3 to 7 on Mohs scale depending on specific mineral composition; Color: Light tan, beige, brownish-cream; Luster: Dull, earthy; Texture: Fine-grained to medium-grained sedimentary matrix; Structure: Massive or clastic.
- Color
- Light tan, beige, brownish-cream
- Luster
- Dull, earthy
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Physical properties
Hardness: 3 to 7 on Mohs scale depending on specific mineral composition; Color: Light tan, beige, brownish-cream; Luster: Dull, earthy; Texture: Fine-grained to medium-grained sedimentary matrix; Structure: Massive or clastic.
Formation & geological history
Formed through the accumulation and cementation of organic debris, shell fragments, or mineral grains (calcite/quartz) in shallow marine or terrestrial depositional environments.
Uses & applications
Commonly used as construction aggregate, building stone, manufacturing cement, or soil conditioning in agriculture.
Geological facts
Sedimentary rocks like limestone and sandstone cover approximately 75% of Earth's land surface, recording environmental conditions from the geologic past.
Field identification & locations
Can be identified in the field by its porous, granular texture and light beige color; limestone will fizz when exposed to dilute hydrochloric acid.
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Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary