sedimentary
Yellow Jasper
Chalcedony (SiO2) with Goethite/Iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to sandy brown with green moss-like inclusions, Luster: Dull or waxy, Crystal structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to sandy brown with green moss-like inclusions, Luster: Dull or waxy, Crystal structure: Microcrystalline (trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica from water solutions into fissures or cavities in volcanic or sedimentary rocks. The yellow coloration comes from iron-bearing minerals (Goethite) trapped during crystallization.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a healing stone in metaphysical practices.
Geological facts
Jasper is an opaque variety of quartz and is frequently multi-colored. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its supposed protective qualities.
Field identification & locations
Identify in the field by its opacity (it does not transmit light even at the edges), smooth waxy feel when weathered, and high hardness (it will scratch glass). Commonly found in riverbeds and deposits in India, Australia, and the USA.
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