sedimentary

Jasper

Microcrystalline Quartz (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale. Color: Red, brown, yellow, green, or multicolored. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58-2.91.

Hardness: 6
Color: Red, brown, yellow, green, or multicolored
Luster: Vitreous to dull

Identified August 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich solutions in sedimentary environments or hydrothermal veins, often originating from silica precipitates or altered volcanic ash. Can be billions of years old.

Uses & applications

Used in ornamental objects, cabochons for jewelry, carvings, and as a popular specimen for rock collectors and lapidary work.

Geological facts

Jasper has been used throughout human history since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness and ability to take a high polish.

Field identification & locations

Identify by its opaque nature, waxy luster, conchoidal fracture, and vibrant earthy colors. Commonly found worldwide in riverbeds, glacial tills, and weathered outcroppings.