sedimentary
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Opaque mustard yellow/brown with dark grey/black metallic bands; Luster: Dull to waxy; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Opaque mustard yellow/brown with dark grey/black metallic bands; Luster: Dull to waxy; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the circulation of silica-rich fluids in volcanic ash or fine sedimentary deposits. The dark bands are likely hematite or manganese dendrites that formed as impurities within the jasper matrix during or after deposition.
Uses & applications
Commonly used as a lapidary material for cabochons, beads, and pocket stones. It is popular among mineral collectors and used in metaphysical practices as a grounding stone.
Geological facts
Jasper is an impure variety of silica. The presence of iron oxides is what gives this specimen its distinctive yellow and black coloration. Because of its hardness, it has been used by ancient civilizations for tool making and seals.
Field identification & locations
Identify in the field by its smoothness (if water-worn), opaque nature (unlike translucent agate), and its inability to be scratched by a steel knife. Frequently found in riverbeds, beaches, and desert pavements.
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