Tetrasulfur
The element sulfur exists as many allotropes. In number of allotropes, sulfur is second only to Allotropes of carbon, carbon.#Greenwood, Greenwood, 652 In addition to the allotropes, each allotrope often exists in Polymorphism (materials science), polymorphs (different crystal structures of the same covalently bonded S molecules) delineated by Greek prefixes (α, β, etc.). Furthermore, because elemental sulfur has been an item of commerce for centuries, its various forms are given traditional names. Early workers identified some forms that have later proved to be single or mixtures of allotropes. Some forms have been named for their appearance, e.g. "mother of pearl sulfur", or alternatively named for a chemist who was pre-eminent in identifying them, e.g. "Muthmann's sulfur I" or "Engel's sulfur".#Steudel, Steudel, 17 The most commonly encountered form of sulfur is the orthorhombic polymorph of , which adopts a puckered ring – or "crown" – structure. Two other polymorphs ar ...
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