sedimentary
Jasper and Quartzite Breccia
Silicified sedimentary breccia
Hardness of 7 on the Mohs scale; colors include earthy red, brown, and translucent to white; vitreous to waxy luster; cryptocrystalline structure; conchoidal fracture with no true cleavage; specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; colors include earthy red, brown, and translucent to white; vitreous to waxy luster; cryptocrystalline structure; conchoidal fracture with no true cleavage; specific gravity around 2.65.
Formation & geological history
Formed through the fracturing of rock (such as iron-rich jasper and quartz veins) followed by the cementation of those fragments by silica-rich hydrothermal solutions or groundwater during ancient geological activity.
Uses & applications
Commonly collected by rockhounds, used in lapidary work for making cabochons, polished stones, and ornamental carvings.
Geological facts
Breccias are easily recognizable by their angular fragments, contrasting with conglomerates which have rounded pebbles. The red coloring in jasper is typically due to iron oxide impurities.
Field identification & locations
Found globally in riverbeds, glacial tills, and mountainous regions where ancient faulting and hydrothermal activity occurred. Identify by its high hardness (scratches glass) and multicolored angular clasts.
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