sedimentary
Red Jasper (with Quartz veining)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7 (Mohs scale); Color: Deep brick red with white quartz veins; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brick red with white quartz veins
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep brick red with white quartz veins; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or volcanic ash into sedimentary environments. The red color is derived from iron impurities (hematite) present during the silicification process. This specimen appears as a water-worn river pebble.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. High-quality specimens are used in jewelry and as ornamental stones. Industrial uses include grinding media due to its hardness.
Geological facts
In antiquity, Red Jasper was known as the 'rain-bringer' and was used in ancient Egypt for amulets and jewelry. It is a variety of chalcedony and get its name from the Greek word 'iaspis', meaning spotted stone.
Field identification & locations
Identify in the field by its opaque red color and smooth, waxy feel when polished or tumbled. Look for white quartz veining (fracture fills). Commonly found in riverbeds, gravel pits, and coastal areas globally, notably in India, Brazil, and the Southwestern USA.
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