Definition
Blue Granite is an igneous rock and a variety of Larvikite, notable for the presence of thumbnail-sized blue crystals of feldspar
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
-
-
Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From the color of rock, Blue
From Greek trakhus rough’ or trakhutēs roughness
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock