metamorphic
Black Marble (Veined Limestone/Marble)
Recrystallized Limestone / Metamorphic Calcite (CaCO3)
AI-generated identification · may be incorrectHardness: 3-4 on Mohs scale; Color: deep charcoal grey to black matrix with prominent white and pale yellow/orange calcite/dolomite veins; Luster: vitreous to polished silky; Specific gravity: ~2.6-2.8; Cleavage: rhombohedral in calcite veining.
- Hardness
- 3-4 on Mohs scale
- Luster
- vitreous to polished silky
Identified More metamorphic →
Explore Black Marble (Veined Limestone/Marble) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3-4 on Mohs scale; Color: deep charcoal grey to black matrix with prominent white and pale yellow/orange calcite/dolomite veins; Luster: vitreous to polished silky; Specific gravity: ~2.6-2.8; Cleavage: rhombohedral in calcite veining.
Formation & geological history
Formed through the regional or contact metamorphism of organic-rich, bituminous marine limestone. Tectonic stress causes fracturing, allowing carbonate- and mineral-rich hydrothermal fluids to infiltrate and precipitate as distinctive cross-cutting veins.
Uses & applications
Carved into decorative ornaments, polished eggs, sphere carvings, tiles, architectural panels, and luxury countertops (popularly known as Nero Marquina or Portoro-style stone).
Geological facts
The black coloration in dark marble and limestone is typically caused by ancient organic matter (bitumen or graphite) preserved within deep marine sediments prior to metamorphism.
Field identification & locations
Recognized by its soft surface (easily scratched with a steel blade or copper coin) and strong effervescence when exposed to dilute hydrochloric acid. Polished decorative specimens are widely sourced from Pakistan, Spain, Italy, and China.
More like this
