sedimentary

Limestone (with Calcite Veining)

Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Gray to dark charcoal with white/cream veins; Luster: Dull to earthy; Structure: Finely crystalline to massive; Cleavage: None (conchoidal to irregular fracture).

Hardness: 3 on Mohs scale
Color: Gray to dark charcoal with white/cream veins
Luster: Dull to earthy

Identified June 1, 2026More sedimentary →

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Physical properties

Hardness: 3 on Mohs scale; Color: Gray to dark charcoal with white/cream veins; Luster: Dull to earthy; Structure: Finely crystalline to massive; Cleavage: None (conchoidal to irregular fracture).

Formation & geological history

Formed through the accumulation of shell, coral, algal, and fecal debris in marine environments. The visible white lines are secondary calcite veins formed by mineral-rich water filling cracks in the rock.

Uses & applications

Used primarily in construction for crushed stone, road base, and the manufacturing of cement/lime. High-purity specimens are used in the chemical industry.

Geological facts

Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. It often contains microfossils that are not visible to the naked eye.

Field identification & locations

Identify in the field by its gray color, fine-grained texture, and reaction (fizzing) to a 10% hydrochloric acid solution. Common in ancient seabed regions.