1 Definition
1.1 Definition
Vogesite is a porphyritic alkaline igneous rock and is a variety of Lamprophyre which is dominated by essential amphibole, usually hornblende, and potassic feldspar
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth
1.3 History
1.3.1 Origin
1.4.1 Discoverer
1.5 Etymology
From the variety of Lamprophyre Greek lampros bright and shining + porphureos purple
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius
1.6 Class
Igneous Rocks
Igneous Rocks
1.6.1 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
1.7 Family
1.7.1 Group
1.8 Other Categories
Coarse Grained Rock, Fine Grained Rock, Opaque Rock
Opaque Rock