metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden yellow to deep brown with silky luster; Structure: Fibrous quartz; Chatoyancy (cat-eye effect); No cleavage; Specific gravity: 2.64–2.71.
- Hardness
- 7 Mohs
- Color
- Golden yellow to deep brown with silky luster
Identified More metamorphic →
Explore Tiger's Eye in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 7 Mohs; Color: Golden yellow to deep brown with silky luster; Structure: Fibrous quartz; Chatoyancy (cat-eye effect); No cleavage; Specific gravity: 2.64–2.71.
Formation & geological history
Formed through the replacement of fibrous asbestos (crocidolite) minerals with silica (quartz), a process known as pseudomorphism. Most deposits are found in Precambrian iron formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's mineral for metaphysical and aesthetic purposes.
Geological facts
The unique shimmer (chatoyancy) is caused by the parallel orientation of the quartz fibers and altered amphibole fibers. When the minerals are replaced but remain blue, it is called Hawk's Eye.
Field identification & locations
Identify in the field by its distinct golden-brown banding and silky chatoyant light reflections when rotated. Commonly found in South Africa, Australia, and Brazil.
More like this
