sedimentary
Red Jasper with Quartz Vein
Microcrystalline quartz (Chalcedony), SiO2
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Opaque red color with a contrasting white or clear quartz vein. Waxy to vitreous luster with conchoidal fracture.
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Physical properties
Mohs hardness of 6.5 to 7. Opaque red color with a contrasting white or clear quartz vein. Waxy to vitreous luster with conchoidal fracture.
Formation & geological history
Forms from the accumulation of silica-rich sediments or volcanic ash, later altered by hydrothermal fluids depositing quartz in fractures.
Uses & applications
Used primarily for lapidary work, cabochons, ornamental carvings, and collector display specimens.
Geological facts
Red jasper has been used since ancient times for talismans, seals, and jewelry due to its durability and rich color.
Field identification & locations
Identify by its opaque red color, hardness scratching glass, and lack of visible crystal grains. Found worldwide, notably in India, Brazil, and the USA.
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