sedimentary
Red Jasper
Silicon Dioxide (SiO2) containing Iron Oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull or waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull or waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.6-2.9
Formation & geological history
Formed primarily as a result of the deposition of silica from volcanic ash or water in sedimentary environments. Its red color is derived from high iron oxide content trapped during chemical precipitation.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons), or for industrial purposes like abrasive grit, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'mother of all stones' in some cultures and was used by ancient Egyptians for amulets and jewelry to symbolize the blood of Isis.
Field identification & locations
Identify by its deep red color, characteristic conchoidal fracture patterns, and durability (it will easily scratch glass). It is commonly found in riverbeds or desert regions world-wide.
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