The exposures are limited and might be concealed under Miocene rocks at the southeastern part of Cotabato Cordillera extending from Cotabato City to … D) The pre-metamorphic rock was a shale or mudstone containing organic matter. C) The graphite lubricated shearing movements along a fault, causing a schist to form. It was called Alicia Schist since the rocks is mainly exposed at the town of the same name, located northeastern part of the island. Chlorite schist (also known as green schist) is a metamorphic rock which is believed to form from regional metamorphism, where temperatures and pressures associated with metamorphic rocks are low, (around 300 - 500 °C) and up to a maximum pressure of 10 kilobars. The rock shown above is a auriferous sulfidic chlorite schist. The Lay Dam Formation is the westernmost and grades into the Cheaha Quartzite. (7.7 centimeters across at its widest) Chlorite is a common greenish to greenish-gray metamorphic mineral. The dark greenish-gray material is chamosite chlorite, which makes up the bulk of the rock. Chlorite is also a common metamorphic mineral, usually indicative of low-grade metamorphism. This is the oldest formation which consists of piedmontite schist, quartzo-feldspathic schist, quartz, chlorite epidote schist and amphibolite schist. Actually, chlorite is a group of phyllosilicate minerals, a common example of which is chamosite chlorite: (Fe+2,Mg,Fe+3)5Al(Si3,Al)O10(OH,O)8 - iron magnesium hydroxy-oxy-aluminosilicate. Hillabee Chlorite Schist is the easternmost of four rock units of Talladega belt. It occurs in the quartz, albite, sericite, chlorite, garnet assemblage of pelitic schist. Chlorite schist (8.2 cm across) with black, octahedral crystals of magnetite (Fe 3 O 4). The Cheaha grades into the Abel Gap Formation, which grades eastward into the Hillabee. In the vicinity of Bacon Peak most of this rock is an actinolite-chlorite schist with small amounts of epidote. Chlorite schist is a moderately common metamorphic rock. The Hillabee forms the major mafic stratigraphic horizon in the northern Alabama Piedmont. Slight metamorphic gold mobilization and tight structural folding has resulted in the formation of auriferous greenschist pods along fold axes. Other rock types noted in the greenschist unit are tremolite schist, stilpnomelane-muscovite schist, and crossite schist. chlorite schist The word schist is derived from the Greek word schízein meaning "to split", which is a reference to the ease with which schists can be split along the plane in which the platy minerals lie. Like other schist, it contains the common schist mineral, muscovite mica. Exposure measures 3,200 m thick from its northern contact with the Peach Bottom Formation at Peters Creek to its southern contact with the State-Line ultramafic complex. Peters Creek Formation is composed of metagraywacke and mica-chlorite schist (interpreted as metapelite) with lesser amounts of metaconglomerate, quartzite, and greenstone. B) The schist formed from a quartz-rich, sedimentary limestone. It is the diagnostic species of the zeolite facies and of lower greenschist facies. On Mount Shuksan, epidote is more abundant and epidote-actinolite and actinolite-epidote schists are common. Chlorite schist from the Precambrian of Michigan, USA. It is a formation consisting of schists with three mineral compositions that grades from chlorite schists, quartz-sericite schist to amphibolite schist (Faustino et al., 2000).