sedimentary
Limestone with Calcite Veins
Calcium Carbonate (CaCO3) - Sparry Limestone
Hardness: 3 on Mohs scale; Color: Gray matrix with white veins; Luster: Dull/earthy (matrix) to vitreous (veins); Cleavage: Perfect rhombohedral in calcite portions; Specific Gravity: 2.71
- Hardness
- 3 on Mohs scale
- Color
- Gray matrix with white veins
- Luster
- Dull/earthy (matrix) to vitreous (veins)
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Physical properties
Hardness: 3 on Mohs scale; Color: Gray matrix with white veins; Luster: Dull/earthy (matrix) to vitreous (veins); Cleavage: Perfect rhombohedral in calcite portions; Specific Gravity: 2.71
Formation & geological history
Formed from the accumulation of shell, coral, algal, and fecal debris in marine environments. The white veins are formed by secondary mineralization where calcium-rich fluids filled fractures in the rock, followed by precipitation of calcite crystals.
Uses & applications
Commonly used as a building material, aggregate for concrete, in the production of cement, for soil neutralization, and as a decorative stone for gardening or crafts (as seen here with writing).
Geological facts
Limestone occupies about 10% of the total volume of all sedimentary rocks. The presence of veins indicates that the rock underwent tectonic stress or thermal changes that cracked the stone after its initial formation.
Field identification & locations
Can be identified in the field by its gray color and the white, relatively soft veins that can be scratched with a copper penny. It will react and fizz (effervesce) if a weak acid like vinegar is applied. Found globally in areas that were once ancient seabeds.
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