igneous
Weathered, vuggy quartz-rich rock (possibly quartz vein material)
Likely massive quartz (SiO₂) with iron-oxide staining and dark mineral inclusions; exact rock type cannot be confirmed visually.
AI-generated identification · may be incorrectOff-white to tan, rough and granular with cavities and dark inclusions; quartz has Mohs hardness 7, vitreous luster on fresh surfaces, and no cleavage. The pictured weathered surface obscures crystal form and any reliable specific-gravity estimate.
Identified More igneous →
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Physical properties
Off-white to tan, rough and granular with cavities and dark inclusions; quartz has Mohs hardness 7, vitreous luster on fresh surfaces, and no cleavage. The pictured weathered surface obscures crystal form and any reliable specific-gravity estimate.
Formation & geological history
Could represent quartz deposited from silica-rich fluids in fractures, later weathered; the image does not establish its age or setting. Quartz veins occur in many rock types and geological ages.
Uses & applications
Quartz-rich material is used for silica, aggregate, and collecting; this rough specimen appears more suited to display than jewelry or construction.
Geological facts
Quartz is a common crustal mineral and can fill fractures as veins; iron oxides commonly impart tan or rusty staining.
Field identification & locations
Look for glassy fresh breaks, hardness sufficient to scratch glass, and absence of cleavage; cavities alone do not identify the rock. Quartz veins are widespread worldwide, but locality is unknown here.
