Definition
Origin
Discoverer
Etymology
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Other Categories
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava
From Andes mountains, where it is found in abundance
Fine Grained Rock, Opaque Rock
Hyaloclastite is an aggregate of fine, glassy debris formed by the sudden contact of hot, coherent magma and cold water or water-saturated sediment
Fine Grained Rock, Opaque Rock