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There are inclusions in minerals consisting of only one single phase – solid, liquid or gaseous. Single phase inclusions are very common for solid particles (inclusions of other minerals or glass corresponding to solidified melt from crystallization medium). Gaseous single phase inclusions are common in natural and artificial glasses and synthetic materials formed from a melt.
Single phase liquid inclusions are not so common because the entrapment of a fluid in a cavity is usually produced at high pressure and temperature conditions. And when it is cooled to room temperature, initially homogeneous fluid is separated in two phases – liquid and gaseous, forming very common two-phase liquid-vapor inclusions.
Typical examples of single phase inclusions are further considered in the corresponding sections.
Single-phase inclusions: Solid – pyrite crystals in quartz; Liquid – thin films with interference colors in aquamarine, Gaseous – bubbles in artificial glass, imitation of emerald.