sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull to vitreous, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Dull to vitreous, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine volcanic ash or silica-rich sediments. The red color is caused by high concentrations of iron inclusions (hematite). It can be found in sedimentary deposits or as secondary fillings in volcanic rocks.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative ornaments, lapidary arts, and as a semi-precious healing stone in metaphysical practices.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and used by ancient Egyptians for amulets. It is characterized by its total opacity, even in thin slices.
Field identification & locations
Identify in the field by its characteristic red color, extreme hardness (it will scratch glass/steel), and smooth conchoidal (shell-like) fracture patterns. Frequently found in riverbeds and desert environments in regions like India, Brazil, and the Southwestern USA.
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