sedimentary
Fancy Jasper
Silicon Dioxide (SiO2) with iron and organic inclusions
Hardness: 6.5-7 (Mohs), Color: Multicolored (green, red, brown, yellow), Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Microcrystalline, Cleavage: None, Fracture: Conchoidal.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Multicolored (green, red, brown, yellow), Luster: Vitreous to waxy, Crystal Structure: Hexagonal (Trigonal), Microcrystalline, Cleavage: None, Fracture: Conchoidal.
Formation & geological history
Formed through the accumulation of fine-grained silica in hydrothermal veins or sedimentary environments. Colors are created by varying amounts of iron oxides, hydroxides, and other minerals that infiltrated the quartz during formation.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative ornaments, stone carvings, and as a popular specimen for crystal collecting.
Geological facts
Fancy Jasper is often referred to as the 'Stone of Tranquility.' While mostly jasper, it is technically an opaque variety of chalcedony. No two pieces are ever identical due to the chaotic swirl of mineral impurities.
Field identification & locations
Identify by its opaque nature, high hardness (cannot be scratched by steel), and characteristic forest green mixed with brick red or dusty mauve. Commonly found in India, Brazil, and Africa.
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