sedimentary
Fancy Jasper (Multicolor Agate/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 on Mohs scale; Color: Mottled red, brown, white, and translucent; Luster: Vitreous to waxy; Structure: Cryptocrystalline/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Mottled red, brown, white, and translucent
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mottled red, brown, white, and translucent; Luster: Vitreous to waxy; Structure: Cryptocrystalline/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica-rich groundwater into cavities or fractures in sedimentary or volcanic rock. These specimens often originate from the Cretaceous period or earlier, where mineral impurities like iron oxide (hematite) create the red and brown zones.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), metaphysical practices, and as ornamental landscaping or aquarium stones.
Geological facts
Jasper is often referred to as the 'Supreme Nurturer' in folklore. Unlike agate, which is translucent, jasper is defined by its opacity, though many 'fancy' specimens like this one are a transition between agate and jasper (sometimes called 'Jaspagate').
Field identification & locations
Identify by its multicolored, patchy appearance and high hardness (it cannot be scratched by a steel knife). Commonly found in riverbeds and gravel deposits worldwide, notably in India, Brazil, and the Southwestern USA. Collectors look for high color contrast and lack of fractures.
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