sedimentary
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
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.
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Physical properties
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.
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.
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