sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown to deep brick red with fine quartz veins or dark micro-fractures; Luster: Vitreous to dull/waxy when beach-worn; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9
- Hardness
- 6
- Luster
- Vitreous to dull/waxy when beach-worn
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown to deep brick red with fine quartz veins or dark micro-fractures; Luster: Vitreous to dull/waxy when beach-worn; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of microcrystalline quartz along with iron oxides (hematite), which give it its characteristic red color, often in marine sedimentary environments or as secondary vein fillings in altered igneous rocks.
Uses & applications
Used widely in lapidary arts for cabochons, beads, decorative carvings, and tumbling, as well as in ornamental landscaping and crystal collection.
Geological facts
Red jasper has been used since antiquity; ancient Egyptians associated it with the blood of Isis and carved it into protective amulets and seals.
Field identification & locations
Identify in the field by its rich red color, high hardness (cannot be scratched by steel), fine-grained opaque texture, and smooth beach-worn shape. Commonly found along rivers, coastal beaches, and gravel deposits worldwide.
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