Definition
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Discoverer
Etymology
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Other Categories
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
Aplite is a fine-grained granite composed mainly of feldspar and quartz
From German Aplit, from Greek haploos simple + -ite
Fine Grained Rock, Opaque Rock