sedimentary
Yellow Jasper Ocher
Limonitic Chert (SiO2 with FeO(OH)·nH2O)
Hardness: 6.5-7 (Mohs scale), Color: dull yellow to brownish-orange, Luster: earthy to waxy, Structure: microcrystalline, Sp. Gravity: 2.5-2.9
- Hardness
- 6
- Luster
- earthy to waxy, Structure: microcrystalline, Sp
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: dull yellow to brownish-orange, Luster: earthy to waxy, Structure: microcrystalline, Sp. Gravity: 2.5-2.9
Formation & geological history
Formed through the accumulation of silica in sedimentary environments, often enriched with iron oxides like limonite or goethite during weathering or hydrothermal activity.
Uses & applications
Used historically as a pigment (ocher) for painting and currently as a lapidary material for cabochons and decorative gravel.
Geological facts
Yellow ocher is one of the oldest pigments used by humans, seen in cave paintings dating back tens of thousands of years. This piece appears to be a silicified variety, making it harder than pure clay ocher.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel nail) and its distinct mustard-yellow streak. Frequently found in river beds or areas with iron-rich soil.
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