sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Hardness: 6.5-7 on the Mohs scale. Color: Mustard yellow to golden brown with dark reddish-brown banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Microcrystalline/Cryptocrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58-2.91.

Hardness: 6
Luster: Vitreous to waxy

Identified June 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily in sedimentary environments when silica-rich fluids permeate porous rock or volcanic ash, slowly precipitating microcrystalline quartz. The yellow hues are caused by iron oxides (limonite/goethite) trapped within the quartz structure. These pebbles are often tumbled and rounded by river or stream action.

Uses & applications

Used extensively in jewelry for cabochons and beads, as ornamental decor, in lapidary arts for carving, and as a popular 'healing stone' in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Old French 'jaspre', meaning 'spotted or speckled stone'. Yellow jasper specifically was historically associated with protection during travel.

Field identification & locations

Identify in the field by its opacity (even on thin edges), its hardness (will scratch glass), and its smooth, waxy surface when river-worn. Commonly found in riverbeds, desert regions, and coastal areas globally.

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