sedimentary
Limestone (or Sandstone)
Calcium Carbonate (CaCO3) / Silica (SiO2)
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.
- 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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