Marble Foliated Metamorphic Rock

Types of non foliated metamorphic rocks include marble quartzite and hornfels.

Marble foliated metamorphic rock.

Non foliated metamorphic rocks. The specimen shown above is about two inches five centimeters across. Most people are surprised to learn that so. The major differences between foliated and nonfoliated metamorphic rocks are in the areas of texture appearance and the type of pressure applied during recrystallization.

If only looking at rock samples in a laboratory one can be sure of the type of metamorphism that produced a foliated metamorphic rock such as schist or gneiss or a hornfels which is unfoliated but one cannot be sure of the type of metamorphism that produced an unfoliated marble or quartzite. Marble is a non foliated metamorphic rock that is produced from the metamorphism of limestone or dolostone. Some examples of non foliated metamorphic rocks include quartzite marble amphibolite and hornfels. Not all parent rocks have platy or elongated minerals and when these rocks undergo metamorphism the individual mineral grains do not align.

It is composed primarily of the mineral calcite caco 3 and usually contains other minerals such as clay minerals micas quartz pyrite iron oxides and graphite under the conditions of metamorphism the calcite in the limestone recrystallizes to form a rock that is. It is composed primarily of calcium carbonate. Marble is commonly used for sculpture and as a building material. Marble is a metamorphic rock composed of recrystallized carbonate minerals most commonly calcite or dolomite marble is typically not foliated although there are exceptions in geology the term marble refers to metamorphosed limestone but its use in stonemasonry more broadly encompasses unmetamorphosed limestone.

The pressure applied to the reforming rock causes the differences in the way the rock looks once recrystallized and determines whether it will be foliated or nonfoliated. Non foliated metamorphic rocks are rocks that have been changed by heat and pressure into rocks with a non layered or banded appearance. Lapis lazuli the famous blue gem material is actually a metamorphic rock. Metamorphic rocks arise from the transformation of existing rock types in a process called metamorphism which means change in form.