an Entity references as follows:
Calcium arsenate is the inorganic compound with the formula Ca3(AsO4)2. A colourless salt, it was originally used as a pesticide and as a germicide. It is highly soluble in water, in contrast to lead arsenate, which makes it more toxic. The minerals Ca3(AsO4)2·10H2O and Ca3(AsO4)2·11H2O are hydrates of calcium arsenate.