Definition
Trachyandesite is an extrusive igneous rock.
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Indonesia
Pennines, England
Discoverer
Unknown
J.J. Ferber
Etymology
From French trachyandésite, trachy + andésite andesite, a lava intermediate in composition between trachyte and andesite
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, Opaque Rock
Coarse Grained Rock, Opaque Rock