metamorphic

Tiger’s-eye-bearing quartzite

Quartzite, chiefly SiO₂, with fibrous crocidolite pseudomorphs and iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7; brown-gold to gray, vitreous to silky luster, granular quartz mosaic, and possible chatoyant sheen. It appears dense and non-cleaving, with white-gray quartz and rusty limonite/goethite staining.

Identified September 14, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone was metamorphosed and recrystallized, commonly during Precambrian tectonic events; iron-rich amphibole fibers were altered to quartz and iron oxides. The image likely shows a polished or naturally worn fragment.

Uses & applications

Used as a decorative stone, cabochon, carving material, and collector specimen; quartzite is also used as aggregate and durable building stone. Strong chatoyancy increases jewelry value.

Geological facts

Tiger’s eye forms through replacement of crocidolite fibers by quartz while retaining fibrous texture. Brown coloration generally reflects iron oxidation, distinguishing it from blue hawk’s-eye.

Field identification & locations

Identify by very high hardness, quartz-rich granular texture, brown-gold bands, and a reflective silky band when viewed under directional light; common sources include South Africa, Australia, India, and Namibia.