sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brick red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brick red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from volcanic ash or water-rich fluids in cracks and cavities, with high iron oxide (hematite) content providing the red pigment. It is often found in prehistoric sedimentary beds or hydrothermal veins.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular collector's gemstone due to its high polish.
Geological facts
Red Jasper has been used by ancient civilizations for thousands of years; Egyptians used it in amulets for fertility and protection, and it is known as the 'Stone of Endurance' in metaphysical circles.
Field identification & locations
Identify by its deep red color, extreme hardness (will scratch glass), and its opaque, smooth-textured surface even when unpolished. Frequently found in riverbeds and coastal areas where harder minerals accumulate.
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