sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Jasper is a variety of chalcedony that forms when silica-rich fluids permeate through volcanic ash or sedimentary rocks. The red color is caused by the presence of iron oxide (hematite) inclusions during the solidification process.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular stone for tumbling and collecting. Historically used for seals and physical protection amulets.
Geological facts
Red Jasper was known as the 'stone of endurance' in ancient times. It was also referred to as the 'blood of Mother Earth' by various indigenous cultures due to its deep red hue.
Field identification & locations
Identified by its opaque nature (it does not transmit light even at the edges), its deep red color, and its smooth, waxy feel when polished. Widely found in gravel pits, riverbeds, and desert regions globally.
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