sedimentary
Purple Jasper
Silica-rich Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 Mohs; Color: Purple with yellow/gold inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Purple with yellow/gold inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Purple with yellow/gold inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica-rich fluids in volcanic ash or sedimentary layers. The purple hues are typically caused by iron or manganese impurities, while the yellow-brown areas are often limonite or goethite inclusions.
Uses & applications
Commonly used in lapidary arts for cabochons, beads, and decorative carvings. Highly valued by collectors for its unique color patterns.
Geological facts
Jasper is an opaque variety of chalcedony. This specific color combination is often called 'Royal Imperial Jasper' or 'Morganite Jasper' depending on the locality and specific mining claim.
Field identification & locations
Identify in the field by its waxy luster, hardness (will scratch glass), and smooth, shell-like (conchoidal) fracture surfaces. Commonly found in regions with historical volcanic activity such as Mexico, India, or the Western USA.
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