sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with iron oxide inclusions)
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); SG: 2.58-2.91.
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); SG: 2.58-2.91.
Formation & geological history
Formed primarily through the deposition of silica in groundwater within volcanic ash or sedimentary rocks. The yellow color is caused by the presence of Goethite or other iron hydroxide inclusions.
Uses & applications
Commonly used for lapidary work, cabochons, beads for jewelry, and as a popular pocket stone for collectors. Historically used for ornaments and seals.
Geological facts
Jasper was a favorite gem in antiquity and is mentioned in several ancient texts including the Bible. Yellow jasper specifically is often associated with the 'Solar Plexus' in metaphysical lore.
Field identification & locations
Identify by its opacity (unlike translucent citrine), waxy feel when wet, and inability to be scratched by a steel knife. Frequently found in riverbeds and coastal areas as water-worn pebbles.
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