sedimentary

Limestone with Calcite Veining

Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Grey matrix with white/cream veins; Luster: Dull to earthy (matrix), vitreous (veins); Structure: Massive/Fine-grained; Cleavage: Prefers rhombohedral in crystal form.

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

Identified June 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in marine environments from the accumulation of shell, coral, and algal debris. The veining (stockwork) occurs when tectonic stress creates fractures that are later filled by precipitating calcite from mineral-rich water.

Uses & applications

Primarily used in construction (aggregate, cement), agriculture (lime), and as a decorative stone in landscaping or interior design.

Geological facts

Limestone covers about 10% of the Earth's total land surface and is the primary component of most cave systems through the process of chemical weathering.

Field identification & locations

Identify by a 'fizz' test with weak acid (vinegar). Common in areas with prehistoric seafloors. Collectors look for unique vein patterns or fossil inclusions.