sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, tan, or ochre; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow, tan, or ochre
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, tan, or ochre; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich fluids in volcanic ash or sedimentary beds. The yellow coloring is primarily due to the presence of goethite or other iron oxides during the silicification process.
Uses & applications
Used primarily as decorative lapidary material, cabochons for jewelry, and in metaphysical practices as a 'grounding' stone. Often used for tumbled stones or carved ornaments.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was used by ancient civilizations for bow drills and cylinder seals. Yellow Jasper is specifically associated with solar plexus chakra themes in folklore.
Field identification & locations
Identify by its waxy texture, opacity (does not let light through), and conchoidal fracture (smooth, curved breaks). Found globally in riverbeds or coastal areas where erosion has exposed silica deposits.
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