sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
Hardness: 3 on Mohs scale; Color: Grayish-white to tan; Luster: Dull/Earthy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.3-2.7
- Hardness
- 3 on Mohs scale
- Color
- Grayish-white to tan
- Luster
- Dull/Earthy
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3 on Mohs scale; Color: Grayish-white to tan; Luster: Dull/Earthy; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.3-2.7
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris in warm, shallow marine waters. These specific pieces show signs of mechanical weathering and may be part of construction aggregate.
Uses & applications
Primary source for lime, cement production, crushed stone for road base, railroad ballast, and agricultural soil conditioner.
Geological facts
Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. It is the primary material used in the construction of the Great Pyramids of Giza.
Field identification & locations
Can be identified in the field by its softness (can be scratched by a penny) and its effervescent reaction to a drop of diluted hydrochloric acid or strong vinegar. Found globally in ancient seabed regions.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary