sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Red, brown-red, terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); SG: 2.58-2.91
- Hardness
- 6
- Color
- Red, brown-red, terracotta
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Red, brown-red, terracotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); SG: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water or volcanic ash, occurring in hydrothermally altered environments or as a secondary mineral in sedimentary basins. Primarily Paleozoic to Mesozoic in age.
Uses & applications
Used widely in lapidary arts for cabochons, beads, and carvings; also used in decorative architectural elements and as a collector's stone.
Geological facts
Red Jasper's color comes from iron (hematite) inclusions. It was highly prized in the ancient world, mentions of which appear in the Bible as one of the stones in the High Priest's Breastplate.
Field identification & locations
Identify by its deep red color, opacity (it does not let light through), and smooth, waxy luster when tumbled. Common in river beds and desert regions in the USA (Southwest), India, and Brazil.
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