mineral
Tumbled brown feldspar-rich rock, possibly tiger’s-eye or brecciated quartz
Indeterminate from image; likely quartz (SiO₂) with iron-stained feldspar or amphibole
AI-generated identification · may be incorrectBrown to golden-brown, opaque to translucent edges, vitreous-to-silky luster, and irregular fractured surfaces; apparent hardness about 6–7 Mohs. No diagnostic cleavage or crystal form is clearly visible.
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Physical properties
Brown to golden-brown, opaque to translucent edges, vitreous-to-silky luster, and irregular fractured surfaces; apparent hardness about 6–7 Mohs. No diagnostic cleavage or crystal form is clearly visible.
Formation & geological history
Likely a naturally silicified or metamorphic fragment, with coloration from iron oxides; exact age and formation setting cannot be determined photographically.
Uses & applications
Small pieces are mainly sold as curios, lapidary rough, or decorative specimens; confirmed tiger’s-eye or attractive quartz may be used in cabochons and jewelry.
Geological facts
The visible pale diagonal band could be quartz veining or a reflective fibrous layer, but the image does not establish tiger’s-eye identification.
Field identification & locations
Test hardness against glass, inspect for chatoyancy under a moving light, and check streak and cleavage; tiger’s-eye shows a strong moving silky band, while feldspar commonly cleaves. Comparable material occurs in quartz veins and metamorphic terrains worldwide.
