sedimentary
Jasper (Red and Yellow)
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown and mustard yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown and mustard yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica from volcanic ash or water, typically in sedimentary or metamorphic environments. The colors are derived from varying concentrations of hematite (red) and goethite (yellow).
Uses & applications
Used primarily in lapidary work for jewelry (cabochons), ornamental stone carvings, and as a collector's specimen. Historically used for making tools and seals.
Geological facts
Jasper is a microcrystalline variety of quartz. The name 'jasper' means 'spotted or speckled stone' and it has been used by ancient civilizations for amulets and tools for thousands of years.
Field identification & locations
Identify by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds, desert landscapes, and volcanic regions globally.
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