sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale), Color: Green with dark bands/streaks, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline quartz), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich microfossils or precipitation from hydrothermal fluids, often in marine environments. This specimen likely formed during the Precambrian or Paleozoic eras and has been smoothed by fluvial or glacial action.

Uses & applications

Commonly used in lapidary arts for cabochons, beads, and decorative carvings. Green jasper is frequently used in jewelry and as an ornamental stone in interior design.

Geological facts

Green jasper was known as the 'rain bringer' in ancient cultures. It is a variety of chalcedony that contains impurities—usually iron oxides or chlorite—giving it its distinct opaque green color and banded patterns.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a knife), opaque transparency, and smooth, conchoidal fracture patterns. Frequently found in riverbeds, glacial tills, and desert pavements.