TYPES OF SANDS.
Coral sand “Coral sand” has several meanings. Find out what it really is. Coral sand is generally light-colored sand (or gravel) which is mostly composed of calcareous fragments of biogenic origin. The term “coral sand” is pretty loosely defined and understood in several different ways. Volcanic sand Volcanically active regions have their own unique type of generally dark-colored sand with a characteristic mineral assemblage. Sand samples of volcanic origin are of two dominant types: clastic detritus eroded from a volcanic terrain and products of explosive volcanic eruptions (pyroclastic sediments, also known as tephra). The first group of volcanic sand is similar to most other types of sand in terms of genesis. However, they generally have different composition from the so-called normal continental quartz-rich sand Olivine sand Olivine is very unstable in the weathering environment. Still, it is surprisingly common sand mineral in some regions and sometimes
