sedimentary
Limestone with Calcite Crystals
Sedimentary Rock containing Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale), Color: Cream, tan, or light gray, Luster: Dull to vitreous (crystals), Structure: Massive to microcrystalline with visible secondary crystal growth, Cleavage: rhombohedral in crystals
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 (Mohs scale), Color: Cream, tan, or light gray, Luster: Dull to vitreous (crystals), Structure: Massive to microcrystalline with visible secondary crystal growth, Cleavage: rhombohedral in crystals
Formation & geological history
Formed through the accumulation of shell, coral, algal and fecal debris in warm, shallow marine waters. Vugs and cavities often fill with secondary calcite crystals precipitated from groundwater over geological time.
Uses & applications
Used primarily in construction (crushed stone, cement manufacturing), agriculture (soil conditioner), and industrial manufacturing.
Geological facts
Limestone accounts for about 10% of the total volume of all sedimentary rocks. It is essential for the production of glass and the purification of molten iron (flux).
Field identification & locations
Identify by its reaction to cold dilute hydrochloric acid (it will fizz/effervesce). Look for porous textures or crystalline pockets in outcrop locations.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary