sedimentary
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
Hardness: 3 on Mohs scale; Color: Grey matrix with white/cream veins; Luster: Dull to earthy (matrix), vitreous (veins); Structure: Massive/Fine-grained; Cleavage: Prefers rhombohedral in crystal form.
- Hardness
- 3 on Mohs scale
- Color
- Grey matrix with white/cream veins
- Luster
- Dull to earthy (matrix), vitreous (veins)
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Physical properties
Hardness: 3 on Mohs scale; Color: Grey matrix with white/cream veins; Luster: Dull to earthy (matrix), vitreous (veins); Structure: Massive/Fine-grained; Cleavage: Prefers rhombohedral in crystal form.
Formation & geological history
Formed in marine environments from the accumulation of shell, coral, and algal debris. The veining (stockwork) occurs when tectonic stress creates fractures that are later filled by precipitating calcite from mineral-rich water.
Uses & applications
Primarily used in construction (aggregate, cement), agriculture (lime), and as a decorative stone in landscaping or interior design.
Geological facts
Limestone covers about 10% of the Earth's total land surface and is the primary component of most cave systems through the process of chemical weathering.
Field identification & locations
Identify by a 'fizz' test with weak acid (vinegar). Common in areas with prehistoric seafloors. Collectors look for unique vein patterns or fossil inclusions.
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