sedimentary
Red Jasper
Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions
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
- Color
- Brick red to brownish-red
- Luster
- Dull to vitreous
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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 from the deposition of silica-rich fluids in volcanic ash or sedimentary rocks. The red color is caused by the inclusion of iron oxides (hematite) during its microcrystalline formation over millions of years.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative lapidary arts, and as a 'grounding stone' in metaphysical practices.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Greek, and Latin. Red Jasper is often associated with durability and was used by ancient civilizations for seals and talismans.
Field identification & locations
Identify in the field by its opaque nature, smooth conchoidal fracture (curved surfaces like glass), and its ability to scratch glass. Commonly found in areas with past volcanic activity or in riverbeds where it has been naturally tumbled.
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