sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Opaque reddish-brown due to iron inclusions; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Color: Opaque reddish-brown due to iron inclusions
Luster: Dull to waxy

Identified July 15, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Opaque reddish-brown due to iron inclusions; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Formation & geological history

Formed from silica-rich sediment or volcanic ash fluid that precipitates in cracks or hydrothermal veins. The red color is usually from Hematite inclusions (iron oxide). This specimen has been rounded by fluvial or wave energy.

Uses & applications

Used primarily as decorative carvings, tumbled stones, jewelry (cabochons), and as an ornamental landscaping stone. Historically used for tool making due to its fracture patterns.

Geological facts

Red jasper has been used since antiquity; it was known in ancient Egypt and the Minoan civilization. It is often referred to as a supreme nurturer stone in metaphysical circles.

Field identification & locations

Identify in the field by its opacity (it will not let light through even at thin edges, unlike agate), its smooth water-worn texture on beaches, and its hardness (it will scratch glass). Commonly found in gravel beds and along coastlines.