sedimentary

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 (Mohs scale); Color: Dark grey with white veins; Luster: Dull to earthy (matrix), Vitreous (veins); Texture: Fine-grained with crystalline fractures; Cleavage: Rhombohedral (in veins).

Hardness: 3 (Mohs scale)
Color: Dark grey with white veins
Luster: Dull to earthy (matrix), Vitreous (veins)

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 3 (Mohs scale); Color: Dark grey with white veins; Luster: Dull to earthy (matrix), Vitreous (veins); Texture: Fine-grained with crystalline fractures; Cleavage: Rhombohedral (in veins).

Formation & geological history

Formed through the accumulation of marine skeletal fragments (coral, forams) or chemical precipitation from sea water. The white veins indicate subsequent tectonic activity where mineral-rich water filled cracks, recrystallizing as calcite.

Uses & applications

Used primarily in construction as aggregate, in the production of cement/lime, and as a soil conditioner in agriculture. Pure specimens can be used in industry for acid neutralization.

Geological facts

Limestone contains about 10% of the total volume of all sedimentary rocks. It often contains fossils that give a record of ancient marine life and environments.

Field identification & locations

Identify in the field using a drop of weak acid (like vinegar or HCl), which will cause the rock to fizz (effervesce). Look for fine-grained grey matrix with intersecting white crystalline lines.