metamorphic
Quartz-bearing metamorphic rock, likely quartzite with dark mica/amphibole
Quartzite or quartz-rich schist; chiefly SiO₂ quartz with biotite, hornblende/amphibole, and iron-oxide staining
AI-generated identification · may be incorrectWhite, translucent quartz forms a coarse crystalline vein or mass within a dark, foliated matrix; vitreous luster, no visible cleavage in quartz, and likely Mohs hardness 6.5–7. Dark minerals may show weak foliation and cleavage. Exact identification is limited by the photograph.
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Physical properties
White, translucent quartz forms a coarse crystalline vein or mass within a dark, foliated matrix; vitreous luster, no visible cleavage in quartz, and likely Mohs hardness 6.5–7. Dark minerals may show weak foliation and cleavage. Exact identification is limited by the photograph.
Formation & geological history
Likely metamorphosed sandstone or quartz-rich protolith intruded or segregated into quartz veins, then fractured and stained by oxidized iron-bearing fluids. Age depends on locality and cannot be determined visually.
Uses & applications
Used decoratively as ornamental stone and collected as a hand specimen; quartz-rich rock may be crushed for aggregate, but this irregular piece has little commercial value.
Geological facts
Quartz veins commonly appear white because of recrystallization and fluid deposition; rusty red-brown patches are typically hematite or limonite weathering products.
Field identification & locations
Test the white material with a steel file or glass: quartz should scratch glass and resist a steel knife. Look for foliation, mica flakes, and a sugary quartz texture; common in metamorphic belts worldwide.
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