metamorphic
Likely tiger’s-eye rough fragment
Tiger’s-eye (quartz, SiO₂, with fibrous crocidolite-derived inclusions)
AI-generated identification · may be incorrectThe small fragment appears brown-gold along one edge and dark blue-green on its face, but the image is insufficient for firm identification. Tiger’s-eye has Mohs hardness 6.5–7, a silky chatoyant luster, and no prominent cleavage; this specimen’s visible surface appears dull and unpolished.
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Physical properties
The small fragment appears brown-gold along one edge and dark blue-green on its face, but the image is insufficient for firm identification. Tiger’s-eye has Mohs hardness 6.5–7, a silky chatoyant luster, and no prominent cleavage; this specimen’s visible surface appears dull and unpolished.
Formation & geological history
Tiger’s-eye forms when silica replaces fibrous crocidolite during alteration, commonly in iron-rich metamorphic rocks; its age depends on the host deposit. The pictured piece could instead be another dark rock or mineral.
Uses & applications
Tiger’s-eye is cut and polished for beads, cabochons, ornaments, and small carvings; rough fragments are mainly collected or used decoratively.
Geological facts
Its characteristic moving, eye-like band of reflected light is caused by aligned fibrous inclusions and is easiest to see on a polished surface.
Field identification & locations
Confirm by inspecting for silky bands that shift with viewing angle and testing hardness only on an inconspicuous spot. Tiger’s-eye is notably sourced from South Africa and Western Australia; the photo alone cannot establish the identity.
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