Definition
Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
New Zealand
Pennines, England
Discoverer
Patrick Marshall
J.J. Ferber
Etymology
From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite
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