sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: reddish-brown to brick-red; Luster: vitreous to waxy/dull; Crystal structure: trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: none, conchoidal fracture
- Hardness
- 6
- Color
- reddish-brown to brick-red
- Luster
- vitreous to waxy/dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: reddish-brown to brick-red; Luster: vitreous to waxy/dull; Crystal structure: trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: none, conchoidal fracture
Formation & geological history
Formed when fine microcrystalline quartz silica precipitates in sedimentary environments or hydrothermal veins, rich in hematite/iron impurities that impart the red color.
Uses & applications
Used primarily as lapidary material for cabochons, beads, carvings, tumbled stones, decorative ornaments, and metaphysical crystals.
Geological facts
Red jasper has been used since antiquity in seals, amulets, and jewelry. The red color comes from fine inclusions of hematite (iron oxide).
Field identification & locations
Identify by its opaque red to brownish-red color, smooth conchoidal fracture surfaces, and high hardness (scratches glass). Commonly found in South Africa, India, Brazil, Australia, and the USA.
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