sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz with Limonite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica from volcanic ash or sedimentary water sources, where iron-bearing minerals like goethite or limonite infuse the quartz with yellow hues during late-stage hydrothermal processes.
Uses & applications
Used primarily in jewelry (beads, cabochons), lapidary art, and as a popular collectable specimen for its aesthetic earth tones.
Geological facts
Jasper is an opaque variety of chalcedony that can contain up to 20 percent foreign materials; the specific yellow color is typically due to the presence of hydrous iron oxide (limonite).
Field identification & locations
Identified in the field by its opacity (will not let light through edges), smooth waxy feel when worn, and conchoidal fracture patterns. Found globally in river beds and desert regions.
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