sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2 plus various mineral impurities)

AI-generated identification · may be incorrect

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

Identified March 26, 2026More sedimentary →

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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.