Crystals of phenacite, milarite, bertrandite, ancylite, wulfenite, pyrosmalite, and harmotome occur in nordmarkite druses in the Grorud district. The Grorud milarite contains substantial amounts of yttrium and yttrium earths. Milarite and pyrosmalite are new species for Norway.
Contributions to the mineralogy of Norway. No. 30. Minerals from nordmarkite druses.