sedimentary

Yellow Jasper / "Yellow Turquoise"

Microcrystalline Quartz (SiO2) with Hematite/Limonite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on Mohs scale; Color: mustard yellow to pale yellow with dark brown to reddish-purple webbed veins; Luster: vitreous to waxy when polished; Fracture: conchoidal; Specific Gravity: ~2.6 - 2.8

Hardness: 6
Luster: vitreous to waxy when polished

Identified October 3, 2026More sedimentary →

Explore Yellow Jasper / "Yellow Turquoise" in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed from silica-rich waters percolating through sedimentary deposits or volcanic ash beds, where iron oxides (limonite/hematite) provide the yellow base color and infiltrate micro-fractures to create the distinct brecciated or webbed veining pattern.

Uses & applications

Popular for lapidary work, ornamental carvings (such as polished eggs, spheres, and cabochons), beads, and decorative metaphysical items.

Geological facts

Although frequently marketed under the trade name 'Yellow Turquoise', it is not genuine turquoise (which is a copper aluminium phosphate). Instead, it is an iron-rich jasper or serpentine variety that mimics the spiderweb matrix pattern of turquoise.

Field identification & locations

Identifiable by its dense microcrystalline texture, distinct hardness (cannot be easily scratched by a steel nail, unlike true turquoise or calcite), and characteristic spiderweb-like dark iron veining. Commonly sourced from China and various global jasper localities.