metamorphic
Likely iron-stained quartzite
Quartzite, composed mainly of quartz (SiO₂) with iron-oxide staining
AI-generated identification · may be incorrectTan to rusty brown, granular and somewhat sparkly with a rough fracture; quartz has Mohs hardness 7 and vitreous luster. The image does not show enough detail to confirm the identification or assess crystal structure reliably.
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Physical properties
Tan to rusty brown, granular and somewhat sparkly with a rough fracture; quartz has Mohs hardness 7 and vitreous luster. The image does not show enough detail to confirm the identification or assess crystal structure reliably.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized under heat and pressure, typically during regional metamorphism; the specimen’s age and source cannot be determined from the photo.
Uses & applications
Quartzite is used as building and decorative stone, aggregate, and sometimes as a silica source; this small piece is mainly suitable for collecting.
Geological facts
Iron oxides can stain otherwise pale quartzite brown or reddish, while recrystallized quartz grains make it notably hard and resistant to weathering.
Field identification & locations
Look for interlocking quartz grains and a surface that scratches glass; unlike many sandstones, quartzite tends to fracture through grains rather than around them. Common in metamorphic mountain belts worldwide.
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