sedimentary
Red Jasper
Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red with dark streaks; Luster: Dull to Vitreous/Waxy; Crystal Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red with dark streaks
- Luster
- Dull to Vitreous/Waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red with dark streaks; Luster: Dull to Vitreous/Waxy; Crystal Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the deposition of silica from volcanic ash or water in sedimentary environments. Its red color is derived from high iron content (hematite inclusions).
Uses & applications
Commonly used in jewelry (cabochons, beads), small decorative carvings (like the elephant shown), ornamental items, and stone mosaics.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'stone of endurance' and has been used in seals and amulets since ancient times.
Field identification & locations
Identify in the field by its opacity (even on thin edges), its characteristic 'brick' red color, and its ability to scratch glass. It is commonly found in India, Russia, Brazil, and the USA (southwest states).
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