What is "scrutinyite"

n. (context mineralogy English) An orthorhombic-dipyramidal dark reddish brown mineral containing lead and oxygen.

Scrutinyite is a rare oxide mineral and is the alpha crystalline form of lead dioxide (α-PbO), plattnerite being the other, beta form. The mineral was first reported in 1988 and its name reflects the scrutiny and efforts required to identify it from a very limited amount of available sample material.