Rocks that cool quickly, especially the outer layers of a flow, are primarily composed of glass particles and tiny mafic minerals. This is why the outer surface of a flow is black. … The most abundant felsic mineral in lava rock is plagioclase feldspar, which gives the surfaces a waxy luster
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Why Is Lava Black
Rocks that cool quickly, especially the outer layers of a flow, are primarily composed of glass particles and tiny mafic minerals. This is why the outer surface of a flow is black. ... The most abundant felsic mineral in lava rock is plagioclase feldspar, which gives the surfaces a waxy luster
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