metamorphic
Veined quartz-bearing metamorphic rock
Likely quartzite or siliceous schist with iron-oxide staining
AI-generated identification · may be incorrectGray to cream, fine- to medium-grained matrix with white quartz veins and rusty brown iron oxides; quartz has Mohs hardness 7, vitreous luster, and no cleavage. The specimen appears massive to weakly foliated, with irregular fracture and moderate density (~2.6 g/cm³).
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Physical properties
Gray to cream, fine- to medium-grained matrix with white quartz veins and rusty brown iron oxides; quartz has Mohs hardness 7, vitreous luster, and no cleavage. The specimen appears massive to weakly foliated, with irregular fracture and moderate density (~2.6 g/cm³).
Formation & geological history
Formed when quartz-rich sediment or altered rock was metamorphosed under heat and pressure, with later fractures filled by silica-bearing fluids and stained by oxidation. Its exact geological age cannot be determined from the photograph.
Uses & applications
Primarily a collector specimen; similar quartzite is used as aggregate, building stone, and decorative rock, while quartz veins may be lapidary material. This piece is not gem-quality.
Geological facts
The contrasting white veins are likely recrystallized quartz, whereas the orange-brown zones are iron oxides such as hematite or limonite. Dark areas may represent mica-, chlorite-, or amphibole-rich minerals.
Field identification & locations
Field identification relies on quartz-rich composition, strong scratch resistance, and pale veins cutting a darker metamorphic host; a steel file should not easily scratch fresh quartz. Common in metamorphic belts worldwide, including the Appalachians, Alps, and Precambrian shields.
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