sedimentary
Veined Limestone
Calcite-veined Limestone (CaCO3)
Hardness: 3-4 (Mohs scale), Color: Dark grey or charcoal groundmass with white/cream veins, Luster: Dull to sub-vitreous, Texture: Fine-grained with crystalline veins, Specific Gravity: 2.7
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Physical properties
Hardness: 3-4 (Mohs scale), Color: Dark grey or charcoal groundmass with white/cream veins, Luster: Dull to sub-vitreous, Texture: Fine-grained with crystalline veins, Specific Gravity: 2.7
Formation & geological history
Formed from the accumulation of calcium carbonate (shells/coral) in marine environments. The white veins are calcite that precipitated from calcium-rich fluids filling fractures after the rock was lithified and subjected to tectonic stress.
Uses & applications
Used in construction, lime production, decorative stone, landscaping, and as a component in cement manufacturing.
Geological facts
The white criss-cross patterns are known as 'stockwork' veins. This specific rounded shape indicates it is a stream or beach-worn pebble, polished by water transport over millions of years.
Field identification & locations
Can be identified by a fizz reaction when exposed to weak acid (dilute HCl). Collectors look for high-contrast veining. Found in sedimentary basins worldwide, particularly near old marine coastlines.
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