Define metamorphic rock. metamorphic rock synonyms, metamorphic rock pronunciation, metamorphic rock translation, English dictionary definition of metamorphic rock. Sedimentary or igneous rock altered by great heat or pressure, e.g. limestone changed to
Metamorphic rock, any rock that results from the alteration of preexisting rocks in response to changing conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. The preexisti
Metamorphic rocks are rocks formed from other types of existing rock due to changes in heat or pressure. Learn about the definition and examples of metamorphic rocks and discover facts about how these rocks are formed. What Are Metamorphic Rocks? Rocks are divided into three main categories: ig...
Schist is a foliated metamorphic rock made up of plate-shaped mineral grains that are large enough to see with an unaided eye. It usually forms on a continental side of a convergent plate boundary where sedimentary rocks, such as shales and mudstones, have been subjected to compressive forces...
A single rock unit such as the Tuscarora Sandstone of the central Appalachians might fully fit the definition of quartzite in the parts of its extent where its quartz grains have been metamorphosed into a durable interlocking mass. It would be better called "sandstone" in other areas. Between ...
Table 1a.Definitions of the main specific rock names which have to be given preference over the equivalent structural root names schist, gneiss, or granofels Amphibolite:Metamorphic rock mainly (to more than 50% vol.) consisting of green, brown, or black amphibole and plagioclase. The modal co...
Metamorphic rocks are rocks formed from other types of existing rock due to changes in heat or pressure. Learn about the definition and examples of...
This alteration increased the size of the mineral grains and segregated them into bands, a transformation which made the rock and its minerals more stable in their metamorphic environment. ADVERTISEMENT Gneiss can form in several different ways. The most common path begins with shale, which is a ...
The rock was then buried and subjected to enough directed pressure to move the clay mineral grains towards parallel alignment, and enough heat and chemical activity to begin transforming the clay mineral grains into chlorite or a mica mineral. At that point, it was the metamorphic rock known as...
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. ADVERTISEMENT What is Slate? Slate is a fine-grained, foliated metamorphic rock ...