sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 on the Mohs scale; Color: Brick red to deep brownish-red; Luster: Dull to waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep brownish-red
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Brick red to deep brownish-red; Luster: Dull to waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine silica-rich sediment or volcanic ash. The red color is derived from high iron content (hematite inclusions) that oxidized during the rock's formation, often in marine or hydrothermal environments.
Uses & applications
Commonly used in lapidary arts for cabochons, beads, and carvings. Historically used for seals and amulets. Also used as a decorative stone in landscaping and aquariums.
Geological facts
Jasper has been a popular gemstone since antiquity; it is mentioned in the Bible and was favored by ancient civilizations like the Minoans and Egyptians for its supposed protective qualities.
Field identification & locations
Identify by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found in gravel beds, river banks, and desert regions globally, notably in India, Brazil, and the USA.
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