Definition: The word "acoelomous" is a name for a type of stone, which is also known as an olivine. It is composed mainly of an olivine mineral compound, with other minerals like magnetite, garnet, quartz, feldspar and mica present in the mixture. There are two main types of acoelomous: 1) The first type refers to a variety of rocks which have been exposed to high levels of heat. These rocks are known as metamorphic rocks, such as the metamorphic schist. They can vary in texture from smooth to rough and may contain small grains of other minerals like iron oxide or aluminum oxide. 2) The second type refers to the rarest form of acoelomous rock which is known as chert or banded chert. These rocks are usually very light in color, they have a grayish hue to them, and often show signs of erosion over time. They are also found in mountain areas where heat can cause the rock to expand and become softer. The definition for acoelomous is that it is a variety of rock that is exposed to high levels of heat, which leads to changes in its composition from what it would have been if it had not been heated. It has become more common over the past few years due to increased mining activity and the use of geologists to identify rocks based on their chemical properties.