Definition
Adakite is an intermediate to felsic volcanic rock that has geochemical characteristics of magma which is said to be formed by partial melting of altered basalt that is subducted below volcanic arcs
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Adak, Aleutian Islands
Pennines, England
Discoverer
Defant and Drummond
J.J. Ferber
Etymology
From Adak, Aleutian Islands
From Grit + Stone
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock