Minerals from metamorphoric Rock

Mica slate is metamorphorized rock, which in contrast to argillaceous shale has been subjected to a higher degree of transformation. It emerged from the clay through tectonic movements of the earth’s crust over millions of years and in the process of earth’s transformation was transported into the deeper regions of the earth’s crust.

Mica slate is made up of medium to coarse-grained stones with a mostly easily visible metamorphic, parallel aligned microstructure (metamorphic parallel texture). The portion of layered silicates (above all muscovite and biotite, with minor amounts of paragonite) is above 50%, the feldspar content is under 20%. Besides quartz other components may appear including garnet, staurolite, tourmaline and distene. The mineral granules are recognizable with the naked eye and if not, then a magnifying glass. They can be several centimeters long in some instances.

Characteristic is the particularly velvety sheen on the surface. This comes from the reformation of the minerals during it metamorphosis. This is due to the mica minerals sericite and muscovite.

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