sedimentary

Quartz Vein in Limestone

Calcium carbonate with silicon dioxide (SiO2 in CaCO3)

AI-generated identification · may be incorrect

Hardness varies from 3 for limestone to 7 for quartz. Colors include grey, white, and brown with a vitreous to earthy luster. Massive crystal structure with distinct contrasting bands.

Identified November 2, 2026More sedimentary →

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Physical properties

Hardness varies from 3 for limestone to 7 for quartz. Colors include grey, white, and brown with a vitreous to earthy luster. Massive crystal structure with distinct contrasting bands.

Formation & geological history

Formed when silica-rich hydrothermal fluids filled fractures within pre-existing limestone formations millions of years ago.

Uses & applications

Used primarily as decorative landscape stone, tumbling material, and geological specimen collecting.

Geological facts

Differential weathering often causes the harder quartz veins to stand out in relief against softer eroded limestone host rock.

Field identification & locations

Easily identified by hard white quartz veins cutting sharply through softer grey sedimentary limestone. Found globally in regions with sedimentary rock beds.