metamorphic
Quartz-veined Quartzite or Basalt
Metamorphic rock with quartz veins (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, dark grey to greenish matrix with contrasting white quartz veins, vitreous luster, cryptocrystalline or fine-grained structure.
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Physical properties
Hardness of 7 on the Mohs scale, dark grey to greenish matrix with contrasting white quartz veins, vitreous luster, cryptocrystalline or fine-grained structure.
Formation & geological history
Formed through regional metamorphism or hydrothermal fluid activity filling fractures in host rock with silica-rich solutions.
Uses & applications
Used primarily as decorative landscape stone, tumbling material, or geological specimen collecting.
Geological facts
White veins cutting across darker host rocks are commonly known as quartz veining, formed when silica precipitates from hydrothermal fluids circulating in fractures.
Field identification & locations
Identify in the field by testing vein hardness (scratches glass) and observing contrasting white silica veins against a darker rock matrix.
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