Stradner Kogel, Wilhelmsdorf, Bad Gleichenberg, Südoststeiermark District, Styria, Austria

Active quarry in basalt (hauyne-nephelinite). Located SSW of Stradner Kogel mountain (609 m).

The quarry is known for a variety of rare minerals, and the mineralogy is well studied.

On specimen labels, the locality is often only called "Wilhelmsdorf".