mineral
Weathered quartz-bearing rock
Quartz-rich vein material; likely quartz with iron oxides and feldspar, exact rock type uncertain
AI-generated identification · may be incorrectHardness about 6–7 Mohs; cream, yellow, brown, and white coloration; vitreous to dull luster; irregular fracture with no obvious cleavage. Yellow-brown staining is characteristic of limonite/goethite iron oxides.
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Physical properties
Hardness about 6–7 Mohs; cream, yellow, brown, and white coloration; vitreous to dull luster; irregular fracture with no obvious cleavage. Yellow-brown staining is characteristic of limonite/goethite iron oxides.
Formation & geological history
Likely formed as hydrothermal vein material or weathered silicic rock, with iron-rich fluids or oxidation producing the yellow-brown coating. Its precise geological age and host-rock history cannot be determined from the image alone.
Uses & applications
Primarily a collecting specimen; quartz-rich material may be used decoratively, while iron-stained quartz has limited lapidary value unless translucent or attractively patterned.
Geological facts
The yellow color is probably iron-oxide staining rather than natural golden coloration of citrine. A glassy edge, ability to scratch ordinary glass, and lack of fizzing in dilute acid would support quartz identification.
Field identification & locations
Common in quartz veins, granitic terrains, and oxidized mineral deposits worldwide; likely locations include the western United States and other crystalline-rock regions. Estimated value: $1–$10 as an ordinary hand specimen, potentially $20–$50 if unusually crystalline or attractive.
