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. It is the finest grained foliated metamorphic rock. Slate...
Slates are fine grained metamorphic stone that is formed from clay, sedimentary rock shell and sometimes quartz. Characteristically the rock may split into relatively thinner slabs. It is extremely beautiful and more cost effective than most other...
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