sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7 on Mohs scale; Color: Opaque brick red to brownish red; Luster: Vitreous to dull; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Opaque brick red to brownish red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Opaque brick red to brownish red; Luster: Vitreous to dull; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Forms through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, where iron oxides impart the red color during the solidification process. Usually found in ancient sedimentary layers.
Uses & applications
Extensively used for lapidary work, decorative carvings, jewelry making, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Red Jasper has been used since antiquity; it was known as the 'rain bringer' in some cultures and was frequently used in cylinder seals and amulets in Mesopotamia and Ancient Egypt.
Field identification & locations
Identified in the field by its distinct dull red color, high hardness (will scratch glass), and smooth, waxy feel when water-worn. Common in river beds and desert regions worldwide, particularly in India, Brazil, and the USA.
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