mineral

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Hydroxide inclusions

Hardness: 6.5-7 on Mohs scale; Color: mustard yellow to brownish-yellow; Luster: waxy to dull; Crystal Structure: trigonal (microcrystalline quartz); Cleavage: none, conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: mustard yellow to brownish-yellow
Luster: waxy to dull

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluid percolates through sedimentary or volcanic rocks, depositing fine-grained quartz along with iron oxides/hydroxides (goethite) that give it the characteristic yellow color.

Uses & applications

Commonly used for lapidary work, tumbled stones, jewelry beads, carvings, and decorative landscaping rock. Also popular among crystal collectors and hobbyists.

Geological facts

Yellow jasper derives its warm earthy hue from goethite or other iron hydroxide minerals embedded within the dense microcrystalline quartz structure. It is extremely durable and takes a high polish.

Field identification & locations

Identified by its smooth texture, complete opacity, conchoidal fracture, and mustard-yellow tone often marked with thin brown or dark veinlets. Commonly found along riverbeds, beaches, and desert gravels globally.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

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Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

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Schist

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Septarian Pebble

Septarian nodule / Concretion

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Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

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Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

sedimentary