igneous
Basalt with Quartzite
Mafic extrusive igneous rock in contact with quartz-rich metamorphic host rock
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, dark black mafic interior contrasting with pinkish-tan quartz matrix, fine-grained aphanitic texture with vitreous luster on quartz portions.
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Physical properties
Hardness 6-7 on Mohs scale, dark black mafic interior contrasting with pinkish-tan quartz matrix, fine-grained aphanitic texture with vitreous luster on quartz portions.
Formation & geological history
Formed from rapid cooling of mafic lava flows overlying older quartz sandstone, later subjected to regional metamorphism over millions of years.
Uses & applications
Used primarily in geological education, scientific research, and as a decorative specimen for private rock and mineral collections.
Geological facts
This specimen displays a distinct xenolith or intrusive contact relationship, highlighting different geological eras within a single hand sample.
Field identification & locations
Easily identified by the stark color contrast between the dark fine-grained basalt center and the lighter surrounding siliceous rock. Found globally in volcanic provinces.
