sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 (Mohs scale), Color: Deep red to reddish-brown (due to iron inclusions), Luster: Vitreous to dull, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (Conchoidal fracture), Opacity: Opaque
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Deep red to reddish-brown (due to iron inclusions), Luster: Vitreous to dull, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None (Conchoidal fracture), Opacity: Opaque
Formation & geological history
Formed when silica-rich fluids permeate through volcanic or sedimentary rock, with iron oxides providing the characteristic red pigment. Often shaped into smooth river stones by natural water erosion.
Uses & applications
Used extensively for lapidary work, jewelry making (cabochons and beads), spiritual/metaphysical practices, and as decorative landscaping gravel.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'mother of all stones' in some cultures. It is a common variety of chalcedony that gets its color specifically from hematite impurities.
Field identification & locations
Identify by its opacity (unlike carnelian which is translucent), its smooth red surface, and high hardness (it will scratch glass). Commonly found in riverbeds and deposits across India, Brazil, and the USA.
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