sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7.0 (Mohs); Color: Brick red to deep brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Brick red to deep brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic or sedimentary rocks, where the iron oxide (hematite) provides the red color. Typically found in ancient marine environments or volcanic ash beds.
Uses & applications
Commonly used in jewelry for cabochons and beads, as a lapidary material for ornaments, and as a popular specimen for crystal healing and metaphysical collections.
Geological facts
Jasper has been a favorite gemstone of the ancient world; it was used in Egypt for amulets and in the Minoan civilization for seals. It is known as the 'Supreme Nurturer' in gemstone folklore.
Field identification & locations
Identify by its opaque red color, smooth waxy feel when polished, and conchoidal fracture. It is common in riverbeds and desert environments in areas like the Southwestern US, India, and Brazil.
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