sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with impurities of Iron or Goethite
Hardness: 6.5–7 (Mohs scale); Color: Yellow to mustard-olive; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Yellow to mustard-olive
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Yellow to mustard-olive; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
Formation & geological history
Forms through the deposition of silica from water-rich environments or volcanic ash into sedimentary basins. It is an opaque variety of chalcedony, often found in ancient marine or hydrothermal deposits dating back hundreds of millions of years.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental sculpture, and lapidary art. It is also globally traded as a 'healing stone' in spiritual and metaphysical communities.
Geological facts
Jasper is mentioned in many ancient texts, including the Bible and Egyptian scrolls. This specific yellow color is typically caused by the presence of iron oxyhydroxides like goethite within the silica structure.
Field identification & locations
Identify by its complete opacity (light does not pass through), smooth conchoidal fracture, and characteristic 'swirling' patterns. It is frequently found in riverbeds and desert environments in regions like South Africa, Brazil, and the USA (Oregon/Idaho).
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