sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Red, brown, yellow, green (multicolored patterns); Luster: Vitreous to greasy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Red, brown, yellow, green (multicolored patterns)
Luster: Vitreous to greasy

Identified May 5, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Red, brown, yellow, green (multicolored patterns); Luster: Vitreous to greasy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from water or volcanic ash. It often forms in hydrothermal environments or deep-sea deposits where iron oxides provide the red and brown pigment.

Uses & applications

Primarily used for lapidary work, jewelry making (cabochons), interior decoration, and as a healing stone in metaphysical practices.

Geological facts

Jasper is a type of chalcedony. The name means 'spotted or speckled stone' and it has been used by ancient civilizations for seals, talismans, and ornamentation for thousands of years.

Field identification & locations

Identify by its waxy luster, lack of cleavage, and smooth, conchoidal fracture. Often found as rounded pebbles on beaches or in riverbeds. Common in many global locations including India, Brazil, and the USA.