Garyansellite
Garyansellite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Mg₂Fe³⁺(PO₄)₂(OH)·2H₂O.
It crystallizes in the orthorhombic crystal system (space group Pbna). It is a member of the Reddingite structural group.
Key properties: Mohs hardness 4; specific gravity 3.16; Brown streak; Vitreous, bronze [sic] on cleavages luster; optically biaxial.
IMA symbol Gas, IMA status: approved, named in 1981.
A rare low-temperature mineral in fractures in a sedimentary iron formation.
It is found associated with Kryzhanovskite, ludlamite, arrojadite, vivianite, metavivianite, souzalite, quartz.
The mineral was named to honor H. Gary Ansell (1943–), Associate Curator, Canadian National Mineral Collection, Geological Survey of Canada, Ottawa, Canada.