Red slate metamorphic rocks are a metamorphosed shale. Slate can vary in color and is easily broken into sheets for building materials.
Amphibolite schist with cubic pyrite crystals, isle of Giga
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6 Metamorphic Rocks – An Introduction to Geology
6 Metamorphic Rocks – An Introduction to Geology
Metamorphic Rocks- Earth Science
Vivarium Rocks: The Definitive Guide & Complete List
Minerals, Free Full-Text
Rock Identification Guide
Red Slate Specimen (Metamorphic Rock), Approx. 1 (3cm
Geology - Acadia National Park (U.S. National Park Service)
Greater Avalonia—latest Ediacaran–Ordovician “peribaltic” terrane