sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2 plus various mineral impurities)
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Dull or waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Dull or waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Dull or waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sedimentary deposits. The yellow color is typically caused by goethite or other clay mineral inclusions. It can form in various geological ages from Precambrian to recent times.
Uses & applications
Commonly used as a gemstone for cabochons, beads, and decorative carvings. It is popular in metaphysical circles and used in jewelry making due to its high polish and durability.
Geological facts
Jasper was a favorite gem in ancient times, mentioned in Greek, Roman, and Hebrew literature. It is often referred to as 'the supreme nurturer' in gemstone folklore. Because it is opaque, it is structurally distinct from its quartz relatives like citrine.
Field identification & locations
Identify in the field by its opacity (unlike translucent citrine), conchoidal fracture (smooth, curved breaks), and yellow-brown earthy tones. It is commonly found in riverbeds or coastal areas in India, Russia, Brazil, and the USA. For collectors, look for smooth river-worn pebbles or polished nuggets.
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