sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Deep reddish-brown to terra cotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep reddish-brown to terra cotta
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep reddish-brown to terra cotta; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Forms through the deposition of silica from water containing iron oxides and other impurities, often in volcanic or sedimentary environments. This specimen shows signs of beach erosion and stream tumbling.
Uses & applications
Used primarily for jewelry (cabochons), lapidary art, decorative ornaments, and as a popular stone for metaphysical or collector purposes.
Geological facts
The red color is specifically caused by the presence of iron oxide (hematite). In antiquity, it was known as the 'mother of all stones' and has been used for seals and amulets for thousands of years.
Field identification & locations
Identify in the field by its smooth, waxy texture, opaque appearance, and resistance to scratching. It is commonly found in gravel beds, riverbanks, and beaches along the Pacific Coast of North America.
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