Mangangordonite
Mangangordonite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Mn²⁺Al₂(PO₄)₂(OH)₂·8H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Laueite structural group.
Key properties: Mohs hardness 3; specific gravity 2.36; White streak; Vitreous luster; optically biaxial.
IMA symbol Mgdo, IMA status: approved, named in 1989.
Found as a very rare secondary mineral in complex zoned granite pegmatites.
It is found associated with Jahnsite, beraunite, strunzite, strengite, spodumene, quartz, muscovite, fluorapatite (Foote mine, North Carolina, USA); tourmaline, siderite, muscovite.
As the manganese analog of gordonite.
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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