What is Marble, Limestone, Slate amp; Granite Stone?
However, instead of forming from a preexisting limestone (like marble), slate is formed from the lowgrade metamorphism of the sedimentary rock shale and volcanic ash deposited on sea floors. Slate, like shale (quot;mudstonequot;), is a very finedgrained rock of mostly microscopic clay minerals with some microscopic quartz and calcite. Slate can also contain some of the same minerals found in