sedimentary

Limestone with Calcite Veins

Calcium Carbonate (CaCO3) - Sparry Limestone

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Gray matrix with white veins; Luster: Dull/earthy (matrix) to vitreous (veins); Cleavage: Perfect rhombohedral in calcite portions; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Gray matrix with white veins
Luster: Dull/earthy (matrix) to vitreous (veins)

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 3 on Mohs scale; Color: Gray matrix with white veins; Luster: Dull/earthy (matrix) to vitreous (veins); Cleavage: Perfect rhombohedral in calcite portions; Specific Gravity: 2.71

Formation & geological history

Formed from the accumulation of shell, coral, algal, and fecal debris in marine environments. The white veins are formed by secondary mineralization where calcium-rich fluids filled fractures in the rock, followed by precipitation of calcite crystals.

Uses & applications

Commonly used as a building material, aggregate for concrete, in the production of cement, for soil neutralization, and as a decorative stone for gardening or crafts (as seen here with writing).

Geological facts

Limestone occupies about 10% of the total volume of all sedimentary rocks. The presence of veins indicates that the rock underwent tectonic stress or thermal changes that cracked the stone after its initial formation.

Field identification & locations

Can be identified in the field by its gray color and the white, relatively soft veins that can be scratched with a copper penny. It will react and fizz (effervesce) if a weak acid like vinegar is applied. Found globally in areas that were once ancient seabeds.