sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on the Mohs scale. Color: Deep brownish-red to maroon. Luster: Vitreous to waxy. Fracture: Conchoidal. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz).
- Hardness
- 6
- Color
- Deep brownish-red to maroon
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Deep brownish-red to maroon. Luster: Vitreous to waxy. Fracture: Conchoidal. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz).
Formation & geological history
Formed when fine microcrystalline quartz precipitated from silica-rich fluids in sedimentary or low-grade metamorphic environments. The distinct red coloration is derived from trace amounts of hematite (iron oxide) evenly dispersed throughout the silica matrix.
Uses & applications
Used widely for lapidary arts, beads, cabochons, carved ornaments, and decorative polished stones. Historically used for seals and amulets.
Geological facts
Jasper has been used by humans for thousands of years. Ancient civilizations believed red jasper held protective properties and stimulated energy, often linking it to blood and vitality due to its color.
Field identification & locations
Can be identified in the field by its opaque reddish-brown appearance, smooth conchoidal fracture surfaces, and high hardness that easily scratches glass. Commonly found in South Africa, India, Brazil, Madagascar, and the USA.
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