sedimentary
Red Jasper (possibly Wonderstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red with tan or grey banding; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red with tan or grey banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red with tan or grey banding; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The red color is caused by the presence of iron oxide (hematite). Many specimens, like Wonderstone, are rhyolitic tuffs that have been silicified over millions of years.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and decorative carvings. It is popular in the metaphysical community and used in inexpensive jewelry. Industrially, it has historical use as a flux in smelting and as a hard-wearing construction aggregate.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back to Greek, Hebrew, Persian, and Arabic languages. It is often referred to as the 'Supreme Nurturer' in folklore.
Field identification & locations
Identify by its opacity (it does not transmit light even on thin edges), its smooth conchoidal fracture, and extreme hardness—it will scratch glass but cannot be scratched by a steel knife. Common in the Western USA, Africa, and Brazil.
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