Quenselite Locality: Långban , Filipstad , Värmland , Sweden ( Locality at mindat.org ) Picture width 0,5 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Quenselite
Quenselite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula PbMn³⁺O₂(OH).
It crystallizes in the monoclinic crystal system (space group P2/a).
Key properties: Mohs hardness 2.5; specific gravity 6.84; Dark brownish gray streak; Metallic to adamantine luster; optically biaxial.
IMA symbol Qns, grandfathered status — known before the IMA’s founding, named in 1925.
Found in a metamorphosed Fe–Mn orebody (Långban, Sweden).
It is found associated with Calcite, barite, hausmannite, braunite (Långban, Sweden).
The mineral was named to honor Professor Percy Dudgeon Quensel (1881–1966), Swedish mineralogist and petrologist, Stockholm University, Stockholm, Sweden.