1 Definition
1.1 Definition
Ignimbrite is a volcanic rock consisting mainly of pumice fragments, formed by the consolidation of material deposited by pyroclastic flows
Syenite is a coarse-grained igneous rock which is composed mainly of alkali feldspar and various ferromagnesian minerals
2.2 History
2.2.1 Origin
2.2.3 Discoverer
2.3 Etymology
From Latin ignis fire + imber, imbr- shower of rain, storm cloud + -ite
From French syénite, from Latin Syenites (lapis ) (stone) of Syene
2.4 Class
Igneous Rocks
Igneous Rocks
2.5.2 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
2.6 Family
2.6.1 Group
2.8 Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock