Mineral-based Sedimentary/Silica
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
Hardness: 6.5–7 on Mohs scale; Color: Opaque mustard yellow to golden brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Opaque mustard yellow to golden brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Opaque mustard yellow to golden brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments, often in hydrothermal veins or as a secondary mineral in volcanic or sedimentary rocks. The yellow color results from the presence of iron oxide (goethite) mixed within the quartz structure.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. Historically used for making tools and amulets. It is also a popular specimen for crystal healing practitioners and rock collectors.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis', meaning 'spotted stone.' Yellow jasper was traditionally regarded as a protective stone for travelers and was used by ancient Egyptians for jewelry and seals.
Field identification & locations
Identify in the field by its opaque nature (unlike agate which is translucent), its smooth, waxy feel when water-worn, and its resistance to scratching with a steel knife. Frequently found in stream beds, beaches, and glacial till in regions with volcanic or carbonate rock history.
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