sedimentary
Limestone with Calcite Veins
Sedimentary Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale); Color: Gray to brownish-gray with white veins; Luster: Dull/Earthy; Crystal structure: Trigonal (in veins); Cleavage: Perfect rhombohedral in calcite portions; Specific Gravity: 2.7
- Hardness
- 3 (Mohs scale)
- Color
- Gray to brownish-gray with white veins
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3 (Mohs scale); Color: Gray to brownish-gray with white veins; Luster: Dull/Earthy; Crystal structure: Trigonal (in veins); Cleavage: Perfect rhombohedral in calcite portions; Specific Gravity: 2.7
Formation & geological history
Formed in marine environments through the accumulation of shell, coral, and algal debris. The white veins are secondary calcite deposits that filled fractures within the rock after it solidified.
Uses & applications
Used in construction as aggregate, in cement manufacturing, as a soil conditioner in agriculture, and as a decorative stone when polished.
Geological facts
Limestone covers about 10% of the Earth's land surface and is the primary rock found in karst landscapes, which are famous for elaborate cave systems.
Field identification & locations
Identify in the field by its softness (scratched by a copper penny or steel) and its rapid effervescence when exposed to a weak acid like vinegar. Common in ancient sea beds and mountain ranges.
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