sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep reddish-brown; Luster: Dull to vitreous when polished; Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep reddish-brown
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep reddish-brown; Luster: Dull to vitreous when polished; Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed primarily as a result of sedimentation and hydrothermal processes where silica-rich fluids permeate porous rocks or volcanic ash, with the red color derived from iron (hematite) inclusions.
Uses & applications
Used extensively in lapidary work for cabochons, beads, and carvings; historically used for seals and talismans; also used in landscaping and as a decorative stone.
Geological facts
Ancient civilizations called Jasper the 'mother of all stones.' It is often found as a component of banded iron formations which are billions of years old.
Field identification & locations
Identified by its opaque red color and smooth, conchoidal fracture which lacks visible grains. Commonly found in riverbeds or desert regions globally, especially in India, Brazil, and the USA.
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