Items for "Arsenical pigments"

A crystallographic review of arsenic sulfides: effects of chemical variations and changes induced by exposure to light

Crystal data for natural and synthetic arsenic sulfides are reported and discussed. Most of them [α- and β-dimorphite, realgar, β-As₄S₄ phase, pararealgar, Kutoglu’s As₄S₄(II) phase, alacranite, uzonite, orthorhombic As₄S₅ phase] have a crystal structure consisting of a packing of cage-like, covalently bonded As₄S_n (n = 3, 4 and 5) molecules held together by weak interactions of van der Waals character...

Keywords: Arsenic sulfides, Crystal structure, Light-induced alteration, Arsenical pigments