sedimentary

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 on Mohs scale; Color: Grey core with white veining; Luster: Dull to earthy; Crystal Structure: Trigonal (microcrystalline); Cleavage: Perfect rhombohedral in veins; Specific Gravity: 2.71.

Hardness: 3 on Mohs scale
Color: Grey core with white veining
Luster: Dull to earthy

Identified June 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in marine environments from the accumulation of shell, coral, and algal debris over millions of years. The white veins represent later fractures that were filled by calcite precipitation from hydrothermal fluids.

Uses & applications

Used primarily in construction (aggregate, cement), agriculture (soil treatment), and as a common decorative river stone or garden pebble.

Geological facts

Limestone is most likely to contain fossils, and it makes up about 10% of the total volume of all sedimentary rocks on Earth. The white lines are often called 'stress veins' or 'spar veins'.

Field identification & locations

Identify in the field by its grey color and white calcite veins; it will effervesce (fizz) when exposed to a drop of weak acid such as vinegar. Commonly found on beaches and in riverbeds.