sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5–7 on the Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91

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

Identified March 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or volcanic ash into cracks or cavities. Over geological time (often millions of years), the silica crystallizes into microcrystalline quartz. The yellow color is caused by the presence of iron-bearing minerals like goethite.

Uses & applications

Commonly used in lapidary work for making cabochons, beads, and ornamental carvings. It is popular in the jewelry industry for its earth tones and is also a favorite for metaphysical practitioners and rock collectors.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was used by ancient civilizations for seal stones and amulets. Because it is so hard and dense, it can take a high polish that lasts for years.

Field identification & locations

Identify in the field by its opaque nature (it does not transmit light even on thin edges), its characteristic conchoidal fracture (smooth, curved breaks), and its inability to be scratched by a steel knife. It is commonly found in riverbeds, deserts, and volcanic regions globally, particularly in the western USA, Brazil, and India.