sedimentary
Quartz-veined Limestone
Sedimentary limestone with hydrothermal quartz/calcite veins (CaCO3 / SiO2)
Hardness varies from 3 (for the limestone matrix) to 7 (for the quartz veins) on the Mohs scale. Color is typically grey to dark grey with prominent white or translucent veining. Luster is dull to earthy in the matrix and vitreous in the veins.…
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Physical properties
Hardness varies from 3 (for the limestone matrix) to 7 (for the quartz veins) on the Mohs scale. Color is typically grey to dark grey with prominent white or translucent veining. Luster is dull to earthy in the matrix and vitreous in the veins. Cryptocrystalline to microcrystalline structure with distinct fracture-filling veins.
Formation & geological history
Formed through the accumulation of marine organisms (limestone) followed by tectonic fracturing and subsequent hydrothermal fluid deposition of quartz or calcite into the cracks, often millions of years ago.
Uses & applications
Used primarily as decorative landscaping stones, paperweights, or as educational specimens for studying structural geology and mineral injection.
Geological facts
The white lines cutting through the darker grey rock are mineral veins, which form when mineral-rich water flows through cracks in the rock under intense pressure and temperature, eventually depositing crystals in the voids.
Field identification & locations
Easily identified by contrasting white veins running through a grey sedimentary matrix. Found commonly in riverbeds, glacial tills, and coastal areas worldwide where limestone has undergone faulting and hydrothermal activity.
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