1 Definition
1.1 Definition
Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.
1.2 History
1.2.1 Origin
USA
1.2.2 Discoverer
Unknown
1.3 Etymology
From pseudo- + tachylite, a glassy rock generated by frictional heat within faults.
1.4 Class
Metamorphic Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
1.5 Family
1.5.1 Group
Not Applicable
1.6 Other Categories
Fine Grained Rock, Opaque Rock