sedimentary
Limestone with Calcite Veining
Calcium Carbonate (CaCO3) - Biogenic/Chemical Sedimentary Rock
Hardness: 3 on Mohs scale; Color: Dark grey to charcoal with white/cream veins; Luster: Dull (matrix) to vitreous (veins); Structure: Massive/Fine-grained; Cleavage: Rhombohedral in calcite crystals.
- Hardness
- 3 on Mohs scale
- Color
- Dark grey to charcoal with white/cream veins
- Luster
- Dull (matrix) to vitreous (veins)
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Physical properties
Hardness: 3 on Mohs scale; Color: Dark grey to charcoal with white/cream veins; Luster: Dull (matrix) to vitreous (veins); Structure: Massive/Fine-grained; Cleavage: Rhombohedral in calcite crystals.
Formation & geological history
Formed in marine environments through the accumulation of shell, coral, and algal debris. The white veins are calcite that precipitated from groundwater filling fractures post-lithification.
Uses & applications
Used widely in construction as crushed stone, in the production of cement and lime, as a soil conditioner in agriculture, and as decorative building stone.
Geological facts
Limestone or marble with these distinct white veins is often called 'Zebra Stone' in landscaping. It often contains microscopic fossils and reacts vigorously with dilute hydrochloric acid.
Field identification & locations
Identify by its grey color and white calcite veins that can be scratched with a knife. Common in ancient seafloor areas. Look for the 'fizz' test with vinegar or acid to confirm carbonate composition.
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