sedimentary
Red Jasper
Chalcedony (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs); Color: deep red with black or brown inclusions; Luster: vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- deep red with black or brown inclusions
- Luster
- vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: deep red with black or brown inclusions; Luster: vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: none; Specific Gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich fluids permeate through volcanic or sedimentary rock, often acquiring its red color from high iron content. It typically forms in hydrothermal veins or as nodules in sedimentary deposits.
Uses & applications
Used extensively in jewelry for cabochons and beads, ornamental sculptures, and as a popular pocket stone for collectors.
Geological facts
Known as the 'Stone of Endurance' and 'The Supreme Nurturer.' It was used by ancient civilizations for amulets and carvings and is mentioned multiple times in historical and religious texts.
Field identification & locations
Identifiable by its deep mahogany-red color and opacity (unlike carnelian which is translucent). It is found globally with massive deposits in India, Brazil, and the USA.
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