sedimentary
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
Hardness: 6.5 - 7 on Mohs scale. Color: Deep reddish-brown to brick red. Luster: Dull to waxy when wet/smooth. Crystal Structure: Trigonal/Microcrystalline. Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Deep reddish-brown to brick red
- Luster
- Dull to waxy when wet/smooth
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Physical properties
Hardness: 6.5 - 7 on Mohs scale. Color: Deep reddish-brown to brick red. Luster: Dull to waxy when wet/smooth. Crystal Structure: Trigonal/Microcrystalline. Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary or low-grade metamorphic environments, with abundant iron oxide (hematite) giving it its rich red color. Later tumbled and rounded naturally by river or ocean wave action.
Uses & applications
Used for lapidary arts, jewelry, decorative pebbles, cabochons, and rock tumbling. Highly popular among beachcombers and casual rock collectors.
Geological facts
Red jasper has been used since antiquity for seals, amulets, and decorative items. Its red coloration is directly caused by fine inclusions of iron oxide minerals like hematite.
Field identification & locations
Identify in the field by its distinctive reddish-brown color, opacity, hardness (will scratch glass), and rounded water-worn shape. Commonly found on beaches, gravel bars, and riverbeds.
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