sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron inclusions
Hardness (Mohs scale): 6.5-7; Color: Red, brownish-red; Luster: Dull to vitreous; Crystal structure: Hexagonal (trigonal), microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Color
- Red, brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness (Mohs scale): 6.5-7; Color: Red, brownish-red; Luster: Dull to vitreous; Crystal structure: Hexagonal (trigonal), microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich minerals in hydrothermal veins or sedimentary environments. Its red color comes from iron oxide (hematite) inclusions that permeate the stone during the solidification of the silica.
Uses & applications
Commonly used in jewelry as cabochons or beads, ornamental decor, lapidary art, and stone therapy/metaphysical practices.
Geological facts
The name 'Jasper' is derived from a Greek word meaning 'spotted stone.' It has been used historically by ancient civilizations for seals and talismans since at least 1800 BCE.
Field identification & locations
Identify in the field by its opaque red color, smoothness after water erosion, and inability to be scratched by a steel blade. Frequently found in riverbeds and gravel deposits worldwide, including the Western United States, India, and Brazil.
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