sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine-grained silica in hydrothermal veins or sedimentary environments. Its yellow color is derived from iron inclusions such as goethite or limonite.
Uses & applications
Used primarily in lapidary work for cabochons, beads, carvings, and as a collector's stone. It is also historically used in jewelry and ornamentation.
Geological facts
Yellow Jasper is known for its opacity; unlike other forms of quartz, it does not allow light to pass through. It has been used by ancient civilizations for protective amulets.
Field identification & locations
Identify by its matte to waxy appearance, extreme hardness (it will scratch glass), and its distinctive yellow-brown ochre hue. Common in river beds and desert regions worldwide.
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