Bederite
Bederite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ca₂Mn²⁺₄Fe³⁺₂(PO₄)₆·2H₂O.
It crystallizes in the orthorhombic crystal system (space group Pcab). It is a member of the Wicksite structural group.
Key properties: Mohs hardness 5; specific gravity 3.48; Dark olive-green streak; Vitreous luster; optically biaxial.
IMA symbol Bdr, IMA status: approved, named in 1998.
Of rare occurrence in a complex granite pegmatite in mica schist.
It is found associated with Muscovite, quartz, potassic feldspar.
The mineral was named to honor Roberto Beder (1888–1930), Swiss-Argentinian mineralogist.
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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