metamorphic
Quartz Vein in Slate
Metamorphic pelite with hydrothermal SiO2 veins
AI-generated identification · may be incorrectHardness of 7 for quartz and 3 for slate, dark grey with white/yellowish veins, dull to vitreous luster, microcrystalline to cryptocrystalline structure.
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Physical properties
Hardness of 7 for quartz and 3 for slate, dark grey with white/yellowish veins, dull to vitreous luster, microcrystalline to cryptocrystalline structure.
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rock, subsequently fractured and filled by hydrothermal quartz-rich fluids.
Uses & applications
Used primarily as decorative pocket stones, geological study specimens, and occasionally in landscape gravel.
Geological facts
The contrasting light-colored mineral veins cutting across the darker host rock create unique natural geometric patterns often collected as curiosity stones.
Field identification & locations
Identify by the stark color contrast between the soft dark matrix and hard contrasting veins. Commonly found in mountainous regions and riverbeds.
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