sedimentary
Red Jasper
Jasper (Silicon Dioxide) - SiO2
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep terracotta
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Dull to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine microcrystalline silica in volcanic ash or sedimentary deposits, often during the Proterozoic or Paleozoic eras. Hematite inclusions give it the distinct red color.
Uses & applications
Used in jewelry (cabochons, beads), decorative lapidary arts, metaphysical practices, and historical use in seal stones and amulets.
Geological facts
Red Jasper has been used by humans for millennia; it was known as the 'rain bringer' in some Native American cultures and was featured on the breastplate of the high priest in biblical times.
Field identification & locations
Identify in the field by its opaque brick-red color and smooth, waxy feel when water-worn. Common in riverbeds and mountainous regions like the American Southwest, South Africa, and Brazil.
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