sedimentary
Red Jasper (possibly Red Coral or dyed Howlite)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Jasper); Color: Opaque red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Jasper); Color: Opaque red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica in sedimentary or volcanic rock, where iron inclusions provide the red pigmentation. It is found in ancient geological layers worldwide.
Uses & applications
Predominantly used in jewelry as beads and cabochons, ornamental carvings, and 'healing' stones in metaphysical practices.
Geological facts
Jasper has been used by ancient civilizations for thousands of years; it was mentioned in the Bible and used by the Greeks and Romans as a protective amulet.
Field identification & locations
Identify by its matte to waxy luster and high hardness (cannot be scratched by a steel knife). Common in South Africa, Brazil, and the USA. If the color is overly uniform or shows dye in cracks, it may be dyed Howlite.
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