He was one of the first collectors of lazulite, rutile, pyrophyllite, and other minerals. It occurs in association with pyrophyllite, kaolinite, alunite, diaspore, rutile, pyrite, hematite and quartz. Important minerals include diaspore, sulfur and magnesite, pyrophyllite, silica sand and limestone. A major pyrophyllite mine lies near it on the farm Gestoptefontein. Strong regional scale alteration consists of pyrophyllite, chloritoid, muscovite, chlorite, quartz, rutile, and pyrite. The physical and optical properties are pyrophyllite are similar to talc.