sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its red color is derived from high iron content. It can be found in sedimentary deposits or as water-worn pebbles in stream beds.
Uses & applications
Used primarily in jewelry (beads, cabochons), lapidary arts, decorative ornaments, and historically as a tool material due to its sharp conchoidal fracture.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and used in ancient Minoan seals. Its vibrant color is due to the presence of hematite inclusions.
Field identification & locations
Identify in the field by its intense red color, extreme hardness (it will scratch glass), and smooth, shell-like (conchoidal) fracture lines. Often found alongside riverbeds or in areas with old volcanic activity.
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