sedimentary
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale. Color: Brick red to brownish-red with swirling patterns. Luster: Dull to vitreous/waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Brick red to brownish-red with swirling patterns
- Luster
- Dull to vitreous/waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Brick red to brownish-red with swirling patterns. Luster: Dull to vitreous/waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture).
Formation & geological history
Jasper is formed primarily during the deposition of silica-rich sediments in volcanic or hydrothermal settings. The red color is derived from iron oxide (hematite) impurities integrated during the consolidation process, often millions of years old.
Uses & applications
Used in lapidary arts for cabochons, beads, and decorative carvings. Historically used for seals, amulets, and architectural ornamentation.
Geological facts
Red Jasper is known as the 'Stone of Endurance' in folklore. It has been used since antiquity; the Minoans carved seals from it on Crete, and it was a common material for cylinder seals in Mesopotamia.
Field identification & locations
Identify in the field by its opaque red color, smoothness when river-worn, and its ability to scratch glass. Commonly found in riverbeds, glacial deposits, and mountain ranges globally.
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