sardonyxes

[Monty]

Sardonyxes is a rare mineral that has the chemical formula of (Na,Ca)3(Mg2 )(Fe,Co)4(AsO6)7. It is a deep-green colored mineral that was first discovered in the 1950s by a team of scientists from Harvard University. The mineral is found in a few locations around the world, including Canada and Australia. Sardonyxes has a unique structure that consists of two types of octahedral (eight-sided) polyhedra, which are connected to each other through tetrahedral (four-sided) polyhedra. The mineral has a high density and is resistant to corrosion.