sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5 to 7 on the Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Dull to vitreous when polished. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6 to 2.9.
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Dull to vitreous when polished. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.6 to 2.9.
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Over time, these fluids solidify into a dense, opaque variety of chalcedony. The yellow hue is primarily due to the presence of goethite or other iron oxides incorporated during formation.
Uses & applications
Commonly used as a gemstone for jewelry, including beads, cabochons, and tumbled stones. It is also utilized for decorative carvings, inlay work, and is highly valued by mineral collectors for its unique patterns and earthy tones.
Geological facts
Jasper has been used by ancient civilizations for centuries to craft seals and ornaments. Yellow Jasper, in particular, was historically known as a stone of protection and discernment. Some varieties are called 'Picture Jasper' if the patterns resemble landscapes.
Field identification & locations
Identify it in the field by its opaque appearance, smooth conchoidal fracture which leaves sharp edges, and its inability to be scratched by a steel knife. It is frequently found in riverbeds and desert regions of the United States, India, and Madagascar.
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