Pale blue green microcrystals of the extremely rare carbonate-phosphate mineral heneuite from the type and only known locality worldwide: Tingelstadtjern Quarry, Modum, Viken, Norway. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Heneuite
Heneuite is an IMA-recognized mineral species in the phosphate class, with the chemical formula CaMg₅(PO₄)₃(CO₃)(OH).
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 5.5; specific gravity 3.016; White streak; Vitreous luster; optically biaxial.
IMA symbol Hn, IMA status: approved, named in 1983.
Found in a serpentine–magnesite deposit developed in a regional metamorphic terrain.
It is found associated with Althausite, apatite, magnesite, serpentine.
The mineral was named to honor Professor Henrich Neumann (1914–1983), Mineralogical-Geological Museum, University of Oslo, Oslo, Norway.