sedimentary
Red Jasper Pebble
Opaque microcrystalline Quartz (SiO2) with Iron Oxide
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull/Waxy (unpolished) to Vitreous (polished); Structure: Microcrystalline; Cleavage: None; SG: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull/Waxy (unpolished) to Vitreous (polished)
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull/Waxy (unpolished) to Vitreous (polished); Structure: Microcrystalline; Cleavage: None; SG: 2.58-2.91
Formation & geological history
Formed as a chemical precipitate or through the replacement of organic materials by silica. The red color is derived from hematite (iron) inclusions during formation in hydrothermal or sedimentary environments.
Uses & applications
Used extensively in lapidary work for cabochons, beads, and tumbled stones. Historically used for seals and ornamentation.
Geological facts
Ancient Egyptians used Red Jasper for amulets to ensure protection; it is often referred to as the 'Stone of Endurance' in metaphysical circles.
Field identification & locations
Identify by its deep red color, conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds or gravel deposits globally.
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