sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to deep terracotta; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep terracotta
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to deep terracotta; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in cracks or as replacement minerals in volcanic or sedimentary environments. Its red color is derived from iron (hematite) inclusions incorporated during the solidification process.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as an ornamental gemstone for metaphysical collecting.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'warrior's stone' in various cultures and used for talismans. It is found in massive formations rather than individual crystals.
Field identification & locations
Identify by its rich red color, opacity (light will not pass through even on thin edges), and smooth, shell-like (conchoidal) fracture points. It is found worldwide, with major deposits in India, Russia, Brazil, and the USA.
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