Definition
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Iceland
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From German Tachylite, from tachy- + Greek lutos soluble, melting
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
Volcanic
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock