Definition
Larvikite is an igneous rock and a variety of monzonite, notable for the presence of thumbnail-sized crystals of feldspar
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Larvik, Norway
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From the town of Larvik in Norway, where this type of igneous rock is found
From Greek trakhus rough’ or trakhutēs roughness
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock