sedimentary

Limestone with Calcite Veins

Calcite-veined Argillaceous Limestone

AI-generated identification · may be incorrect

Hardness 3-4 on Mohs scale, grayish-brown to dark gray color with yellowish/buff intersecting veins, dull to earthy luster on the matrix with potentially slight vitreous luster on the veins.

Identified September 21, 2026More sedimentary →

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Physical properties

Hardness 3-4 on Mohs scale, grayish-brown to dark gray color with yellowish/buff intersecting veins, dull to earthy luster on the matrix with potentially slight vitreous luster on the veins.

Formation & geological history

Formed in marine environments through the accumulation of calcareous mud and biological debris. The veins formed later when mineral-rich fluids moved through fractures in the rock, depositing calcite.

Uses & applications

General limestone is used extensively in construction, cement production, and agriculture. Small fragments like this are typically found as float and have no commercial value, though they can be of interest to amateur collectors studying structural geology.

Geological facts

The intersecting vein pattern is a classic example of fracture fill, indicating the rock underwent stress causing it to crack, followed by fluid precipitation.

Field identification & locations

Can be identified in the field by its reaction to dilute hydrochloric acid (it will fizz) and its relative softness compared to quartz or chert. Common in many sedimentary basins worldwide.