sedimentary
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale); Color: Dark grey with white veins; Luster: Dull to earthy (matrix), Vitreous (veins); Texture: Fine-grained with crystalline fractures; Cleavage: Rhombohedral (in veins).
- Hardness
- 3 (Mohs scale)
- Color
- Dark grey with white veins
- Luster
- Dull to earthy (matrix), Vitreous (veins)
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Physical properties
Hardness: 3 (Mohs scale); Color: Dark grey with white veins; Luster: Dull to earthy (matrix), Vitreous (veins); Texture: Fine-grained with crystalline fractures; Cleavage: Rhombohedral (in veins).
Formation & geological history
Formed through the accumulation of marine skeletal fragments (coral, forams) or chemical precipitation from sea water. The white veins indicate subsequent tectonic activity where mineral-rich water filled cracks, recrystallizing as calcite.
Uses & applications
Used primarily in construction as aggregate, in the production of cement/lime, and as a soil conditioner in agriculture. Pure specimens can be used in industry for acid neutralization.
Geological facts
Limestone contains about 10% of the total volume of all sedimentary rocks. It often contains fossils that give a record of ancient marine life and environments.
Field identification & locations
Identify in the field using a drop of weak acid (like vinegar or HCl), which will cause the rock to fizz (effervesce). Look for fine-grained grey matrix with intersecting white crystalline lines.
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