mineral
Polished brown stone, possibly tiger’s eye
Uncertain from the image; possibly quartz-rich tiger’s eye (SiO₂)
AI-generated identification · may be incorrectThe smooth, glossy brown piece appears tumbled or polished; its small size and lighting obscure banding and other diagnostic features. Tiger’s eye has Mohs hardness 6.5–7, a vitreous luster, and fibrous quartz structure.
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Physical properties
The smooth, glossy brown piece appears tumbled or polished; its small size and lighting obscure banding and other diagnostic features. Tiger’s eye has Mohs hardness 6.5–7, a vitreous luster, and fibrous quartz structure.
Formation & geological history
If tiger’s eye, it forms when quartz replaces crocidolite fibers during alteration of iron-rich rock; such deposits are commonly associated with Precambrian geology.
Uses & applications
Polished tiger’s eye is used in beads, cabochons, and decorative objects; common pieces have modest value.
Geological facts
Tiger’s eye is recognized by its shifting, silky band of reflected light (chatoyancy), which is not clearly visible here.
Field identification & locations
The image alone is insufficient for a reliable identification. Check for moving chatoyancy under a point light; without it, the stone may be another brown mineral or polished rock.
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Epidote
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