sedimentary

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

AI-generated identification · may be incorrect

Hardness of 6-7 for the sandstone matrix and 3 for the calcite veins, color is greyish-brown with contrasting pale yellow/white veins, luster is dull to earthy, crystal structure is microcrystalline quartz with rhombohedral calcite.

Identified July 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of mineral particles or sand grains in ancient environments, subsequently fractured by tectonic forces allowing mineral-rich fluids to deposit secondary minerals like calcite into the cracks.

Uses & applications

Used primarily as a geological educational specimen, decorative display stone, and in architectural landscaping.

Geological facts

These distinctive vein networks often form when a host rock fractures under stress and hydrothermal fluids precipitate minerals into the openings, creating natural striped or grid patterns known as boxwork or vein sets.

Field identification & locations

Easily identified by contrasting mineral veins cutting across the host rock bedding or fracture planes; commonly found in sedimentary basins and fault zones worldwide.