sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Red, brown, and yellow patterns on a dark gray or black background; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None; Opaque.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Red, brown, and yellow patterns on a dark gray or black background; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None; Opaque.
Formation & geological history
Formed when jasper is fractured through tectonic activity and then resealed by silica-bearing fluids, often containing hematite or goethite giving it the reddish-brown hues.
Uses & applications
Used extensively in jewelry for cabochons, beads, and decorative ornaments due to its high polish and interesting patterns.
Geological facts
The 'brecciated' name comes from the Italian word 'breccia', meaning broken stones or rubble, referring to its fragmented appearance.
Field identification & locations
Look for a water-worn, smooth pebble with distinctive angular 'islands' of color surrounded by a darker matrix. Commonly found in riverbeds and along coastlines in volcanic or sedimentary regions.
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