sedimentary
Red Jasper (Brecciated Jasper)
SiO2 (Silicon Dioxide) with Ferric Iron inclusions
Mohs hardness: 6.5-7; Color: Red with grey, black, or white veining; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red with grey, black, or white veining
- Luster
- Vitreous to dull
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Physical properties
Mohs hardness: 6.5-7; Color: Red with grey, black, or white veining; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments, often fragmented and then recemented by silica, creating the 'brecciated' look.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), decorative ornaments, and as a popular stone for collectors and metaphysical practitioners.
Geological facts
The red color comes from iron oxide (hematite) inclusions. 'Brecciated' refers to the rock being broken and then naturally 'glued' back together by other minerals overtime.
Field identification & locations
Identify by its matte to waxy shine when unpolished and its distinct red color that doesn't scratch easily with steel. Found globally in locations like Brazil, USA (Western states), and South Africa.
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