Colour photograph of the langhofite type specimen, GEO-NRM #20030044. Field of view is ca. 1.2 cm × 0.8 cm. The image is published in an Open Access article, distributed under the terms of the Creative Commons Attribution licence ( https://creativecommons.org/licenses/by/4.0/ ). — Photo: Dan Holtstam, Fernando Cámara and Andreas Karlsson · CC BY 4.0
Langhofite
Langhofite is an IMA-recognized mineral species in the tungstate class, with the chemical formula Pb₂(OH)[WO₄(OH)].
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2.5–3; specific gravity 7.95; White streak; Adamantine luster; optically biaxial.
IMA symbol Lhf, IMA status: approved, named in 2019.
Found in a vug in hematite-pyroxene skarn in a metamorphosed, carbonate-hosted, syngenetic Långban-type, Fe-Mn-(Ba-As-Pb-Sb-W-Be-B) deposit.
It is found associated with Calcite, baryte, fluorapatite, mimetite, galena, covellite, chalcocite.
The mineral was named to honor curator H. Jörgen S. Langhof (b. 1965), Swedish Museum of Natural History, who collected the discovery sample.