sedimentary
Jasper Breccia
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: variegated red, yellow, and grey; Luster: vitreous to dull; Crystal Structure: Microcrystalline; Conchoidal fracture
- Hardness
- 6
- Color
- variegated red, yellow, and grey
- Luster
- vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: variegated red, yellow, and grey; Luster: vitreous to dull; Crystal Structure: Microcrystalline; Conchoidal fracture
Formation & geological history
Formed through the fracturing of jasper and the subsequent cementing together by secondary silica or iron oxides during hydrothermal activity or tectonic stresses.
Uses & applications
Commonly used as a decorative stone, for lapidary work (cabs and tumbled stones), in landscaping, and as a collector's specimen.
Geological facts
Brecciated jasper is often called 'Fragmented Jasper'. The red color specifically comes from the presence of iron oxides such as hematite.
Field identification & locations
Identify in the field by its blocky, angular colorful fragments 'glued' together by a darker matrix. Commonly found in riverbeds and mountainous regions with historical volcanic or tectonic activity.
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