sedimentary
Yellow Jasper
Silicon dioxide (SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Yellow to brownish-yellow with dark inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), 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: Yellow to brownish-yellow with dark inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water or hydrothermal fluids into cracks or cavities, often as a variety of chalcedony. It typically occurs in sedimentary environments or as a secondary mineral in volcanic rocks.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and carvings. It is also a popular collector's stone and used in metaphysical practices for its purported 'grounding' energy.
Geological facts
The name Jasper is derived from the Greek word 'iaspis', meaning spotted stone. It is an opaque variety of quartz that gets its yellow color from iron inclusions (goethite or limonite).
Field identification & locations
Identify by its hardness (will scratch glass), opaque nature, and smooth waxy feel when polished. Commonly found in riverbeds or desert regions of India, Russia, Brazil, and the USA (southwest).
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