Definition
Adamellite is a coarse-grained porphyritic igneous rock, a variety of Monzogranite and dominated by phenocrysts of orthoclase in a granular groundmass of perthite, plagioclase and quartz
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Italy
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From German adamellit and from Monte Adamello, a mountain in Italy, its locality
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, Opaque Rock
Fine Grained Rock, Opaque Rock