sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Brown, tan, and reddish-brown with cream veining; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture.
- Hardness
- 6
- Color
- Brown, tan, and reddish-brown with cream veining
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brown, tan, and reddish-brown with cream veining; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed when jasper is fractured by tectonic activity and later resealed by silica-bearing fluids (silicification), often in sedimentary or hydrothermal environments.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), palm stones for meditation, and decorative ornamental objects.
Geological facts
The term 'brecciated' comes from 'breccia', a geological term for rock composed of broken fragments of minerals or rock cemented together by a fine-grained matrix. It is considered a stone of strength and vitality.
Field identification & locations
Identify by its characteristic fragmented spider-web appearance and high hardness (cannot be scratched by a steel knife). Common in desert regions and riverbeds globally.
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