Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism
From Old French esclate, from esclat (French éclat)
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Mylonite is a metamorphic rock formed by ductile deformation during intense shearing encountered during folding and faulting, a process termed cataclastic or dynamic metamorphism
From Greek mulōn mill + -ite
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock