sedimentary
Jasper (Imperial Jasper style)
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale), Color: Pink, tan, cream, and reddish-brown bands, Luster: Vitreous to waxy (especially when polished), Crystal Structure: Microcrystalline trigonal (Cryptocrystalline quartz), 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: Pink, tan, cream, and reddish-brown bands, Luster: Vitreous to waxy (especially when polished), Crystal Structure: Microcrystalline trigonal (Cryptocrystalline quartz), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids (often associated with volcanic ash or hydrothermal activity) into cavities or cracks within other rocks. The distinct waves and ribbons are created through a process of rhythmic precipitation during many thousands of years of sedimentation.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons), lapidary art, small sculptures, and as a popular specimen for crystal and rock collectors.
Geological facts
Jasper is known as the 'Supreme Nurturer' in metaphysical circles. The specific 'orbicular' or 'banded' patterns seen in this specimen are characteristic of high-quality deposits found in Mexico and the American Southwest. It is technically a variety of chalcedony containing up to 20% foreign materials, which provide its opaque colors.
Field identification & locations
Identify in the field by its opacity (it does not transmit light even on thin edges), its characteristic conchoidal fracture if chipped, and its inability to be scratched by a steel knife. It is frequently found in riverbeds or desert regions of Mexico, Utah, and Oregon.
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