mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Opaque brick red to brownish-red; Luster: Vitreous to dull (polished smooth/waxy); Crystal System: Trigonal (microcrystalline quartz); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Opaque brick red to brownish-red
- Luster
- Vitreous to dull (polished smooth/waxy)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Opaque brick red to brownish-red; Luster: Vitreous to dull (polished smooth/waxy); Crystal System: Trigonal (microcrystalline quartz); Cleavage: None, exhibits conchoidal fracture; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed when microcrystalline quartz precipitates from hydrothermal fluids or silica-rich waters, incorporating iron oxide (hematite) inclusions that give it its distinctive opaque red color. Often found in association with volcanic rocks or sedimentary banded iron formations.
Uses & applications
Used widely in lapidary arts, gemstone jewelry, polished palm stones, decorative carvings, and beads. Popular among rock and mineral collectors.
Geological facts
Jasper has been used as a gemstone since antiquity and was prized by ancient Minoan, Egyptian, and Roman civilizations for seals, amulets, and jewelry. Its rich red color is directly caused by fine particles of hematite trapped within the quartz matrix.
Field identification & locations
Identified by its rich red color, high hardness (scratches glass), opaque appearance, and conchoidal fracture when broken. Commonly found in India, Russia, Brazil, Madagascar, and the southwestern United States.
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