sedimentary
Veined Limestone
Sedimentary Calcite-Veined Rock (CaCO3)
Hardness: 3 on the Mohs scale for calcite veins, 3-4 for host matrix. Color: Dull grey to brownish host rock intersected by white/off-white quartz or calcite veins. Luster: Dull to earthy matrix with vitreous veins. Structure: Fine-grained microcrystalline texture cut by secondary hydrothermal fractures.
- Hardness
- 3 on the Mohs scale for calcite veins, 3-4 for host matrix
- Luster
- Dull to earthy matrix with vitreous veins
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Physical properties
Hardness: 3 on the Mohs scale for calcite veins, 3-4 for host matrix. Color: Dull grey to brownish host rock intersected by white/off-white quartz or calcite veins. Luster: Dull to earthy matrix with vitreous veins. Structure: Fine-grained microcrystalline texture cut by secondary hydrothermal fractures.
Formation & geological history
Formed in warm, shallow marine environments through the accumulation and compaction of organic calcium carbonate debris. The distinct white veins formed later when tectonic stress cracked the rock, allowing mineral-rich hydrothermal fluids (calcite or quartz) to flow through and crystallize in the fissures.
Uses & applications
Crushed stone for road base, concrete aggregate, flux in steel manufacturing, agricultural lime, and landscaping gravel.
Geological facts
Rocks with intersecting vein patterns like this are often referred to as 'wishing stones' in folklore, especially when a single continuous white band completely encircles the rock without breaking.
Field identification & locations
Field identification: Will effervesce (fizz) vigorously with dilute hydrochloric acid if calcite-based. Hardness test with a steel nail can scratch the calcite. Extremely common worldwide in sedimentary basin regions.
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