Outstanding dark orange crystals of the extremely rare Ca-Fe-Sb arsernite mineral stenhuggarite from the type and only known locality worldwide for the mineral (Långban, Filipstad, Värmland County, Sweden) and associated to nice metallic hematite. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Stenhuggarite
A rare calcium-iron-antimony arsenite — a mineral of Sweden's historic iron-manganese mines.
Intro adapted from Wikipedia (CC BY-SA).
Stenhuggarite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaFe³⁺Sb³⁺As³⁺₂O₇.
It crystallizes in the tetragonal crystal system (space group I4_1/a).
Key properties: Mohs hardness 4; specific gravity 4.63; Bright yellow streak.
IMA symbol Shu, IMA status: approved, named in 1966.
Very rare in hematite ore from a metamorphosed Fe–Mn orebody.
It is found associated with Hematite.
The name comes from the Swedish for stonemason, in honor of Dr. Brian Harold Mason (1917–), U.S. National Museum, Washington, D.C., USA, for his contributions to the mineralogy of the Långban deposit.