sedimentary
Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron and manganese inclusions
Hardness: 6.5-7 (Mohs scale); Color: Variegated red, yellow, and cream; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; SG: 2.6-2.9
- Hardness
- 6
- Color
- Variegated red, yellow, and cream
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Variegated red, yellow, and cream; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; SG: 2.6-2.9
Formation & geological history
Formed through the deposition of silica-rich fluids in deep-sea sediments or volcanic ash beds. Similar to Mookaite, these often originate from radiolarian siltstones that have been silicified over millions of years.
Uses & applications
Primarily used as a gemstone for lapidary work, jewelry (cabochons), and as a decorative or metaphysical stone in crystal collections.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used as a tool material and ornament since the Neolithic period.
Field identification & locations
Identify in the field by its conchoidal fracture, high hardness (cannot be scratched by a steel knife), and typical rich, opaque pigmentation. Commonly found in riverbeds or arid sedimentary regions.
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