sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Hematite) inclusions
Hardness: 6.5-7.0 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, where iron oxides impart the red color during lithification.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), ornamental items, and as a popular stone in metaphysical collecting.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its supposed protective qualities.
Field identification & locations
Identify in the field by its deep red color, opacity (light will not pass through even thin edges), and conchoidal fracture. Common in iron-rich sedimentary deposits worldwide, notably India, Brazil, and the USA.
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