sedimentary

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

AI-generated identification · may be incorrect

Hardness: 3 (calcite veins) to 4 (limestone matrix); Color: Dark grey to black matrix with white or cream veins; Luster: Dull to earthy (matrix), vitreous (veins); Structure: Clastic/brecciated; Cleavage: Rhombohedral in calcite veins.

Hardness: 3 (calcite veins) to 4 (limestone matrix)
Color: Dark grey to black matrix with white or cream veins
Luster: Dull to earthy (matrix), vitreous (veins)

Identified May 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the fragmentation of existing limestone due to tectonic activity or collapse (brecciation), followed by the precipitation of calcite from mineral-rich fluids into the resulting fractures.

Uses & applications

Primarily used as decorative stone, aquarium rocks, landscaping material, or lapidary rough for cabochon cutting.

Geological facts

The white lines are called 'veins' and represent the internal scars of the rock where it once broke and healed over millions of years.

Field identification & locations

Identify in the field by checking for the 'fizz' reaction with diluted hydrochloric acid (vinegar may work slowly) and looking for the distinct angular dark fragments separated by white crystalline mineral infill.