sedimentary
Banded Jasper
Silicon Dioxide with Iron Oxide Inclusions (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Reddish-brown, dark grey, tan, and creamy white layering. Luster: Waxy to vitreous. Crystal structure: Microcrystalline/Cryptocrystalline quartz. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Reddish-brown, dark grey, tan, and creamy white layering
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Reddish-brown, dark grey, tan, and creamy white layering. Luster: Waxy to vitreous. Crystal structure: Microcrystalline/Cryptocrystalline quartz. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the deposition of silica-rich fluids combined with iron oxides and clay minerals in sedimentary environments or hydrothermal veins, creating distinctive color banding over millions of years.
Uses & applications
Used primarily in lapidary arts, jewelry (cabochons, beads), decorative carvings, and as collectible polished stones.
Geological facts
Jasper has been used since antiquity for seals, amulets, and ornamental objects. The red and brown colors are caused by varying concentrations of hematite and goethite.
Field identification & locations
Identified by its hardness (cannot be scratched by steel), opaque body, smooth water-worn surface, and clear colored banding. Commonly found in riverbeds, beaches, and volcanic sedimentary formations in Mindanao, Philippines, and worldwide.
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