sedimentary

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

AI-generated identification · may be incorrect

Hardness: 3-4 (matrix), 7 (veins); Color: Dark grey/blue matrix with white or cream veins; Luster: Dull to earthy; Crystal Structure: Microcrystalline (trigonal); Cleavage: Perfect rhombohedral in calcite veins.

Hardness: 3-4 (matrix), 7 (veins)
Color: Dark grey/blue matrix with white or cream veins
Luster: Dull to earthy

Identified April 8, 2026More sedimentary →

Explore Veined Limestone (Micrite) with Quartz/Calcite Veins in the encyclopedia →

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Physical properties

Formation & geological history

Formed in shallow marine environments from the accumulation of lime mud. The white veins are later secondary mineralizations of quartz or calcite that filled fractures caused by tectonic stress.

Uses & applications

Used primarily as crushed stone for construction, decorative gravel, and aggregate. Polished specimens are used in jewelry and as decorative pocket stones.

Geological facts

The 'veins' in the rock are essentially lightning bolts of geological time, showing where the rock cracked and minerals precipitated out of moving groundwater millions of years ago.

Field identification & locations

Look for the distinct contrast between the dark host rock and the white lattice-like veins. Often found on beaches or in riverbeds where water has naturally tumbled the rock smooth.