Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature
History
Origin
-
USA
Discoverer
Alexandre Brongniart and René Just Haüy
Edgar Bailey
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From French schiste, Greek skhistos i.e. split
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock