sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
Hardness: 6.5 - 7 (Mohs scale), Color: Brick red with dark hematite banding, Luster: Dull to Vitreous (Waxy when polished), Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal), Cleavage: None (conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5 - 7 (Mohs scale), Color: Brick red with dark hematite banding, Luster: Dull to Vitreous (Waxy when polished), Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal), Cleavage: None (conchoidal fracture)
Formation & geological history
Formed through the accumulation of silica-rich sediments or volcanic ash. The red color is derived from iron oxide (hematite) impurities integrated during the siltification process. Common in sedimentary or metamorphic layers worldwide.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Jasper is an opaque variety of chalcedony. This specific specimen shows clear banding, which often occurs due to fluctuating chemical conditions during the mineral's formation over millions of years.
Field identification & locations
Identify in the field by its opaque nature (does not let light through even on thin edges), its hardness (can scratch glass), and its characteristic smooth, waxy feel when water-worn. Common in riverbeds and gravel deposits.
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