sedimentary

Jasper with Quartz Veining

Microcrystalline quartz (SiO2) with iron oxide impurities

Hardness of 6.5 to 7 on the Mohs scale, greenish-grey with dark intersecting fracture fillings and a small reddish inclusion, waxy to dull luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.58 to 2.91.

Identified August 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in sedimentary or volcanic environments where silica-rich fluids precipitated microcrystalline quartz in cracks and cavities within host rock, often subjected to subsequent tectonic fracturing and hydrothermal vein-filling over millions of years.

Uses & applications

Used primarily as a lapidary material for tumbling, cabochons, carving, and as a collectible specimen for rockhounds.

Geological facts

The prominent dark intersecting lines visible on this specimen are healed fractures (veinlets) filled with secondary minerals such as quartz, hematite, or dark silicates, which often weather at a different rate than the host rock creating a relief pattern.

Field identification & locations

Can be identified in the field by its hardness (scratches glass), smooth water-worn texture from river or lake action, and distinctive internal veining patterns. Commonly found in riverbeds, glacial tills, and beaches worldwide.

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Quartz pebble

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Sedimentary Sandstone

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Banded Siltstone / Mudstone Pebble

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