Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Quartzite is a non-foliated metamorphic rock that forms by the metamorphism of pure quartz Sandstone
Medium Grained Rock, Opaque Rock
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Alexandre Brongniart and René Just Haüy
From Greek trakhus rough’ or trakhutēs roughness
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock