The perlite occurrence is located 1.6 kilometres north of Skelu Bay.

The area is underlain by a series of sub-aerial dacite to rhyolite flows, domes and pyroclastics of the Upper Oligocene to Lower Pliocene Masset Formation. This plateau volcanic sequence is up to 5 kilometres thick and dips gently to the north-east.

Perlite occurs as a flow-like mass in rhyolite units of the Tartu Facies.