Tiger's Eye (Rough)

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Golden-yellow, brown, reddish; Luster: Silky to vitreous; Structure: Fibrous/Trigonal (quartz); Specific Gravity: 2.64-2.71.

Formation & Geological History

Formed through the replacement of the fibrous mineral crocidolite (blue asbestos) by silica (quartz), while retaining the original fibrous structure. Most deposits are Archean or Proterozoic in age.

Uses & Applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular palm stone for mineral collectors due to its unique optical properties.

Geological Facts

It exhibits a unique optical phenomenon called chatoyancy (the cat's-eye effect). If the iron content is low, it may remain blue, known as Hawk's Eye.

Field Identification & Locations

Identify in the field by its distinct yellow-brown banding and silky luster. It is commonly found in South Africa, Western Australia, India, and Namibia.

Identified on: 4/14/2026

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