Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Eclogite is an extreme metamorphic rock, formed by regional metamorphism of basalt rock under very high pressure and temperature
History
Origin
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Discoverer
Alexandre Brongniart and René Just Haüy
René Just Haüy
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From French, Greek eklogē selection with reference to the selective content of the rock + -ite1
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock