mineral

Iron-stained quartz crystal

Quartz (SiO₂), likely limonite/goethite inclusions or surface coating

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent honey-yellow to clear, with vitreous luster and irregular/conchoidal fracture. Quartz is trigonal and lacks cleavage; brown-orange areas are iron oxides/hydroxides.

Identified August 15, 2026More mineral →

Explore Iron-stained quartz crystal in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness 7 Mohs; translucent honey-yellow to clear, with vitreous luster and irregular/conchoidal fracture. Quartz is trigonal and lacks cleavage; brown-orange areas are iron oxides/hydroxides.

Formation & geological history

Likely formed in a hydrothermal vein or cavity, where silica-rich fluids deposited quartz and later oxidizing fluids stained it with iron minerals. Precise age and locality cannot be determined from the image.

Uses & applications

Used mainly as a collector specimen, ornament, or educational sample; quartz is also important in glass, electronics, ceramics, and abrasives. This rough piece has limited jewelry value unless cut or exceptionally transparent.

Geological facts

The yellow-brown coloration is probably natural iron staining rather than citrine, although heat-treated or irradiated quartz cannot be excluded visually. Quartz commonly forms six-sided prismatic crystals, but this specimen appears fractured and partly encrusted.

Field identification & locations

Identify by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel knife should not scratch it. Common sources include Arkansas and other quartz-vein regions worldwide.