_:b1217776 . _:b1217776 . _:b1217776 . _:b1217776 "Wikipedia:Clay"^^ . _:b1217776 "A group of hydrous aluminium phyllosilicate (phyllosilicates being a subgroup of silicate minerals) minerals (see clay minerals), that are typically less than 2micrometres in diameter. Clay consists of a variety of phyllosilicate minerals rich in silicon and aluminium oxides and hydroxides which include variable amounts of structural water."^^ .