sedimentary
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
Hardness: 3-4 (matrix) to 7 (veins); Color: Gray to dark charcoal with white or translucent veins; Luster: Dull/earthy matrix with vitreous veins; Cleavage: None in matrix, rhombohedral in calcite veins; Specific Gravity: 2.5-2.8
- Hardness
- 3-4 (matrix) to 7 (veins)
- Color
- Gray to dark charcoal with white or translucent veins
- Luster
- Dull/earthy matrix with vitreous veins
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Physical properties
Hardness: 3-4 (matrix) to 7 (veins); Color: Gray to dark charcoal with white or translucent veins; Luster: Dull/earthy matrix with vitreous veins; Cleavage: None in matrix, rhombohedral in calcite veins; Specific Gravity: 2.5-2.8
Formation & geological history
Formed in marine environments through the accumulation of organic debris and chemical precipitation over millions of years. The white veins are secondary mineralizations formed when mineral-rich hydrothermal fluids filled cracks in the rock long after its initial lithification.
Uses & applications
Used primarily in the construction industry as crushed stone, road base, or cement production. Higher quality specimens are used for architectural cladding or landscaping.
Geological facts
Limestone is often fossiliferous, potentially containing microscopic shells or coral fragments. The presence of veins suggests the rock was subjected to tectonic stress that fractured the stone, allowing mineral deposition.
Field identification & locations
Identify in the field by applying a drop of white vinegar or dilute HCl; true limestone will effervesce (fizz). Found globally in sedimentary basins. Collectors look for unique vein patterns or integrated fossils.
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