sedimentary
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
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)
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Physical properties
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.
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.
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