sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
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
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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.
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