Gabrielsonite
Gabrielsonite is an IMA-recognized mineral species in the arsenate class, with the chemical formula PbFe³⁺(AsO₃)O.
It crystallizes in the orthorhombic crystal system (space group P2_1ma).
Key properties: Mohs hardness 3.5; specific gravity 6.67; Pale chocolate-brown streak; Adamantine luster; optically biaxial.
IMA symbol Gbr, IMA status: approved, named in 1966.
Found in a metamorphosed Fe–Mn orebody.
It is found associated with Roméite, nadorite, finnemanite, calcite, barite.
The mineral was named to honor Dr. Olof Erik Gabrielson (1912–), mineralogist, Swedish Museum of Natural History, Stockholm, Sweden.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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