Definition
Harzburgite is a plutonic rock of the peridotite group consisting largely of orthopyroxene and olivine
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Germany
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From the name of a town in Harzburg, Germany
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
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock