sedimentary
Vein-filled Basalt or Limestone
Calcite-veined carbonaceous limestone
AI-generated identification · may be incorrectMohs hardness around 3 to 4, dark brown to black color with prominent white or cream-colored calcite veining, vitreous to dull luster, microcrystalline structure.
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Physical properties
Mohs hardness around 3 to 4, dark brown to black color with prominent white or cream-colored calcite veining, vitreous to dull luster, microcrystalline structure.
Formation & geological history
Formed through the accumulation of organic carbonate sediments later fractured and hydrothermally healed by mineral-rich fluids.
Uses & applications
Commonly collected as a polished specimen or used for decorative landscape stone and crushed aggregate.
Geological facts
The contrasting white veins are typically pure calcium carbonate deposited in tectonic fractures long after the host rock solidified.
Field identification & locations
Easily identified by striking white mineral veins cutting through a dark matrix; found globally in sedimentary basins.
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