sedimentary

Fancy Jasper

Silicon dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Mottled green, yellow, brown, and red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Hardness: 6
Color: Mottled green, yellow, brown, and red
Luster: Vitreous to waxy

Identified April 19, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Mottled green, yellow, brown, and red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from water solution in the cracks of other rocks or alongside volcanic activity over millions of years. It is a variety of chalcedony that contains impurities of iron oxides and organic matter which provide its color.

Uses & applications

Used primarily in lapidary arts for decorative pieces, jewelry beads, cabochons, and as pocket stones or metaphysical 'healing' crystals.

Geological facts

Jasper has been used as a gemstone since antiquity and is mentioned in many historical texts; the 'fancy' variety is specifically prized for its multi-colored, earthy appearance that resembles a forest floor.

Field identification & locations

Identify in the field by its conchoidal fracture, high hardness (will scratch glass), and opaque appearance. Commonly found in riverbeds or deposits in India, Brazil, and Africa.