sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale), Color: Rusty red with white or cream streaks, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), 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: Rusty red with white or cream streaks, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich fluids depositing in cracks of volcanic rocks or within sedimentary beds. The red color is caused by the inclusion of iron oxides (hematite) during its formation process over millions of years.
Uses & applications
Primarily used for lapidary arts, jewelry (beads, cabochons), carvings, and as a popular specimen for rock collectors and metaphysical practitioners.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'warrior's stone' in some cultures and was frequently used in the ancient Mediterranean for seals and decorative items.
Field identification & locations
Identify in the field by its opaque red color, smoothness after weathering, and lack of light penetration. It is commonly found in riverbeds or coastal areas in the Western USA, Brazil, South Africa, and India.
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