Sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5–7 (Mohs); Color: Yellow to mustard-gold; Luster: Dull/Waxy; Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Yellow to mustard-gold
- Luster
- Dull/Waxy
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Physical properties
Hardness: 6.5–7 (Mohs); Color: Yellow to mustard-gold; Luster: Dull/Waxy; Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the accumulation of fine-grained silica in sedimentary environments or hydrothermal veins. The yellow color is caused by the inclusion of hydrated iron oxide minerals like goethite.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and ornamental carvings. Also popular in the metaphysical community and for landscaping aggregate.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was used by ancient civilizations for making tools/weapons due to its hardness and ability to hold a sharp edge when fractured.
Field identification & locations
Identify in the field by its opacity (unlike translucent agate) and its hardness—it will scratch glass but cannot be scratched by a steel knife. Commonly found as water-worn pebbles on beaches and in riverbeds.
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