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* Non-oxides: [[Carbide]]s, [[boride]]s, [[nitride]]s, [[silicide]]s *[[Boron carbide]] ([[boron|B]]₄[[carbon|C]]), which is used in some helicopter and tank [[v

* [[Aluminium nitride]], AlN, can be made from the elements at 800 °C. It is hydrolysed by [[wat .... As a [[gemstone]], its hardness is only exceeded by [[diamond]], [[boron nitride]], and [[carborundum]]. It is almost insoluble in water.