Scoria

Classification：Igneous Rock

Volcanic cinder is a black volcanic rock with many gaps. It is similar to pumice, but its color is deep, its weight is large, and its mafic mineral content is more.

The word "Scoria" is used by geologists to describe many igneous rocks containing many bubbles or gaps.

A general name for the slag - like volcanic boulder that erupts from the volcano. Cinder means porous and vitrified homogeneous conglomerate. The particle size is usually 4~32 millimeters. It is a gas rich melted fragment that is sprayed into the air and condenses in the air. The gas expands and escapes, leaving the gas blowhole, forming a slag like appearance, black and dark brown. The pores are often irregular, round and round, ranging from a number of millimeters to 10 centimeters, distributed around the crater. Scoria refers to the porous pores of andesite and basalt. Sometimes cinder and scoria are used as synonyms.

The word "Scoria" is used by geologists to describe many igneous rocks containing many bubbles or gaps.

The reasons for the formation of Scoria are as follows: when the magma that contains a lot of air is sprayed out, because the magma meets a relatively low pressure environment, the air dissolved by the magma leaves the magma and produces bubbles, which are cooled into solid magma and become a Scoria with many pores.

Scoria is commonly found on volcanic cones. Usually Scoria forms mountains, and the top is crater. It's like the Wellington hills in Oakland, New Zealand.

Another Scoria is generated from the eruption of mud volcanoes. The heated mud will form Scoria cones.