Slate is a metamorphic rock that forms from mudstone or shale. The mudstone or shale normally contains clay or volcanic ash. Slate is unique in that it does not require any type of cementation to hold its particles together.
1 of 1. 1. Slate is a low-grade metamorphic rock that forms from shale under pressure at temperatures of a few hundred degrees or so. Clay minerals in the shale, which originally formed by the breakdown of mica minerals in igneous rocks, begin to revert back to mica.  Slate pencils in India(more specifically southern India) are made from a type of sedimentary rock known … as Shale, which is composed of mud that is a mixture of clay minerals (kaolinite, montmorillonite and illite) and small quantities of other minerals especially quartz and calcite. Slate is metamorphosed shale and is composed of micaceous minerals, and could contain quartz, calcite, dolomite, feldspar, pyrite, rutile, graphite, chlorite, and other minerals. Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by low-grade regional metamorphism. It is popular for a wide variety of uses such as roofing, flooring and flagging because of its durability and attractive appearance. The color of slate is often determined by the amount and type of iron and organic material that are present in the rock. The tectonic environment for producing slate is usually a former sedimentary basin that becomes involved in a convergent plate boundary. Slate is a metamorphic rock that forms from mudstone or shale. The mudstone or shale normally contains clay or volcanic ash. Slate is unique in that it does not require any type of cementation to hold its particles together. It has a very attractive appearance and it is also durable. Interesting Slate Facts: Chalk boards are made of slate and chalk is made of limestone, another type of rock. Slate is used to make turkey calls which are devices that mimic the sound of different turkeys and used by hunters. Slate has a wet-like appearance when exposed to the sun. Slate is a low-grade metamorphic rock, with a dull luster and strong cleavage. It is derived from shale by regional metamorphism. (more below). Slate forms when shale, which consists of clay minerals, is put under pressure with temperatures of a few hundred degrees or so.  New Zealand occurrences-northwest Nelson. Slate is a low grade metamorphic rock generally formed by the metamorphosis of mudstone / shale, or sometimes basalt, under relatively low pressure and temperature conditions.  Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by low-grade regional metamorphism. The specimen shown above is about two inches (five centimeters) across. The color of slate is often determined by the amount and type of iron and organic material that are present in the rock. The tectonic environment for producing slate is usually a former sedimentary basin that becomes involved in a convergent plate boundary. Slate Macro (~ 6 cm long and ~ 4 cm high). 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 is not to be confused with shale, from which it may be formed, or schist. The word slate is also used for certain types of object made from slate rock. The ratio of clay to the other minerals gives the shale its colour. Shale from which slate pencils are made, are light gray in colour. Slate pencils in certain other parts of India are made from soft Soapstone, which is a metamorphic rock, composed dominantly of talc. Slate is metamorphosed shale and is composed of micaceous minerals, and could contain quartz, calcite, dolomite, feldspar, pyrite, rutile, graphite, chlorite, and other minerals. Rating Newest Oldest. Best Answer: Slate is a fine-grained, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism. 
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what rock is slate made from