sedimentary/mineral
Red Jasper
Jasper (Silicon Dioxide) - SiO2
Hardness: 6.5–7 on Mohs scale. Color: Opaque brick-red to brownish-red due to iron inclusions. Luster: Dull to waxy. Crystal structure: Microcrystalline (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Opaque brick-red to brownish-red due to iron inclusions
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale. Color: Opaque brick-red to brownish-red due to iron inclusions. Luster: Dull to waxy. Crystal structure: Microcrystalline (trigonal). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.
Formation & geological history
Formed from the deposition of silica from volcanic ash or water circulating through sedimentary rocks. The red color is caused by iron oxide (hematite) inclusions within the silica during mineralization. Often found in Precambrian and Paleozoic age formations.
Uses & applications
Extensively used as a gemstone in lapidary work (cabochons), jewelry, decorative carvings, and as a metaphysical 'grounding' stone. Historically used for architectural ornamentation and seals.
Geological facts
Jasper was a favorite gem in the ancient world; in Egyptian culture, it was associated with the blood of Isis and used in protective amulets. It is an opaque variety of chalcedony.
Field identification & locations
Identify in the field by its opacity (it does not transmit light even on thin edges), its smooth conchoidal fracture, and it cannot be scratched by a steel knife. Common in gravel pits, riverbeds, and desert regions like the American Southwest and India.
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