What is Slate?
Slate is a fine-grained, metamorphic rock. It gets its unique appearance and character when layers of shale or mudstone shift far beneath the earth’s surface creating thin layers of rock, one on top of another. Slate is composed mainly of clay minerals or micas, silicate minerals that form in distinct layers. Slate often contains high levels of quartz that gives it a unique texture, as well as small amounts of other minerals like calcite, feldspar, pyrite and hematite found deep beneath the earth’s surface.Read more