sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Dull to vitreous/waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Dull to vitreous/waxy

Identified March 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from mineral-rich waters into sedimentary or volcanic environments. The yellow hue is caused by iron hydroxide inclusions (limonite). Found in geologic strata ranging from Precambrian to more recent eras.

Uses & applications

Commonly used in lapidary work for making cabochons, beads, and tumbled stones. Historically used for making tools and weapons (due to conchoidal fracture) and as a decorative stone in mosaics or jewelry.

Geological facts

Jasper belongs to the chalcedony family. Yellow jasper was traditionally used as a protective stone for travelers and was significantly utilized in ancient Egyptian and Native American cultures for amulets and carvings.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent chalcedony), mustard color, and smooth, curved fracture surfaces. Commonly found in riverbeds or desert regions of South Africa, India, and the United States (e.g., Oregon and Utah).

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