Outstanding yellow prismatic crystals of the extremely rare mineral meixnerite from the type locality in Austria (In der Gleisen Quarry, Sankt Oswald, Melk District, Lower Austria, Austria), associated to colorless arrowed aragonite crystals. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Meixnerite
Meixnerite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Mg₆Al₂(OH)₁₆(OH)₂·4H₂O.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Hydrotalcite structural group.
Key properties: Mohs hardness 2; specific gravity 1.9; optically uniaxial.
IMA symbol Mxn, IMA status: approved, named in 1974.
Found as a secondary mineral in serpentinite.
It is found associated with Talc, aragonite.
The mineral was named to honor Professor Heinrich Hermann Meixner (1908–1981), Austrian mineralogist, University of Salzburg, Salzburg, Austria.