Vitrified sand
Introduction '''Vitrified sand''' is sand that has been heated to a high enough temperature to undergo vitrification, which is the melting of the silicon dioxide or quartz that compose common sand. Vitrified sand is a type of natural glass, contrasted with manufactured glass in which soda ash or potash are added to lower the melting point. Pure quartz melts at . There are several natural processes that produce more or less melted sand and one man-made form:* fulgurite is sand fused by a lightning bolt hitting sand. * Impactite such as tektite is sand fused by the compressive heat of a meteor strike including moldavite, a gem quality stone mined in some locations. *frit is partially fused sand plus other chemicals created in the process of glaze and glass making. *Nuclear melt glass, formed by the detonation of a nuclear weapon. Examples include trinitite, created during the Trinity nuclear testVolcanic glass in many forms is not fused sand because it is formed from molten material.
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