The Mítovský quarry is located at the foot of the Kokšín hill (684 masl), an extinct volcano. The rock mined in the quarry is spilit (currently metabasalt). It is a volcanic, outpouring (effusive) rock. It consists of several minerals such as albite, chlorite, actinolite, epidote, humus, partially also carbonate and possibly limonite. Spilite is slightly metamorphosed basalt (basalt) - i.e. metabasalt. The minerals in it are very small, recognizable only with a strong magnifying glass, because this effusive rock solidified from a liquid state very quickly (water environment or lava on the surface) and individual mineral crystals had very little time to crystallize into larger sizes than they are less than millimeters. The opposite of effusion magmatites are granite-type rocks. These rocks also crystallized from liquid magma, but solidified deep below the surface (even several kilometers). There they cooled very slowly and for a long time (on the order of hundreds of thousands of years) and the crystals of individual minerals had enough time to grow to a size of several centimeters. It follows that the longer the magma solidifies, the larger the individual mineral crystals are. About 700 to 800 million years ago, i.e. in the Paleozoic, technically in the Neoproterozoic, the sea spread here, and the earth's plate with the future Czech massif was located deep in the south of the Earth, all the way to the south pole of the earth. At that time, the so-called Cadom orogeny folding was at its peak, during which the individual earth plates collided with the continents, deep tectonic fractures and magma penetration occurred. From these tectonic faults and subduction zones, magma rose to the earth's surface, giving rise to volcanoes and undersea lava flows. There was an outpouring of hot liquid lava on the seabed and thus the formation of so-called pillow lavas. These lavas in the sea solidified very quickly in contact with seawater and formed pillows or loaf-shaped formations. If the volcanic activity lasted for a long time and the lava flows were sufficient, such an amount of lava accumulated that the volcano emerged from the sea. This is precisely the case of Kokšín Hill and the quarry at its foot.
49°35'40.119"N, 13°39'38.283"E
