Definition
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
Trachyandesite is an extrusive igneous rock.
History
Origin
Pennines, England
Indonesia
Discoverer
J.J. Ferber
Unknown
Etymology
From Grit + Stone
From French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock