sedimentary

Limestone (Weathered Aggregate)

Sedimentary Carbonate Rock (CaCO3)

AI-generated identification · may be incorrect

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 April 3, 2026More sedimentary →

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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.