1 Definition
1.1 Definition
Shonkinite is a rare, dark-coloured and intrusive igneous rock which contains augite and orthoclase feldspar as its primary constituents
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
1.4 History
1.4.1 Origin
1.4.2 Discoverer
1.5 Etymology
From the name of Shonkin Sag ranges in the Highwood Mountains of north-central Montana, US
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, Medium Grained Rock, Opaque Rock
Opaque Rock