Brendelite Locality: Güldener Falk Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany Picture width 2 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Brendelite
Brendelite is an IMA-recognized mineral species in the phosphate class, with the chemical formula (Bi,Pb)₂(Fe³⁺,Fe²⁺)O₂(OH)(PO₄).
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 4.5; specific gravity 6.83; Pale brown streak; Vitreous to adamantine luster; optically biaxial.
IMA symbol Bde, IMA status: approved, named in 1997.
A very rare secondary mineral found on the dumps of a Bi–Co–Ni–Ag deposit.
It is found associated with Eulytite, bismutite, bismutoferrite.
In honor of Christian Friedrich Brendel (1776–1861), expert in mining equipment, Neustädtel-Schneeberg, Germany.