Manganohörnesite: Mineral information, data and localities.
Originally named manganese-hoernesite in 1951 by Olof Gabrielson for being the manganese analogue of hornesite (now hörnesite). It was renamed by the IMA (Burke 2008) to manganohörnesite.
A lower hydrate (tetrahydrate) is castellaroite.
Crystals of manganohörnesite may resemble gypsum.
Usually acicular; needle-like crystals or elongated crystals flattened along (010): As star-like aggregates.
Gabrielson, O. (1951) Manganiferous hoernesite and manganese-hoernesite from Långban, Sweden, Arkiv för Mineralogi och Geologi: 1 (11): 333-337.
Hausmannite 2 photos of Manganohörnesite associated with Hausmannite on mindat.org.
Dolomite 2 photos of Manganohörnesite associated with Dolomite on mindat.org.
Akrochordite 1 photo of Manganohörnesite associated with Akrochordite on mindat.org.
20.8.10 Geigerite Mn2+5(AsO4)2(HAsO4)2 · 10H2O Tric.
Fleischer, M. (1954) New mineral names. American Mineralogist: 39: 159-160.
Burke, E.A.J. (2008) Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. The Mineralogical Record: 39: 131-135.
analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA; Kampf, A.R., Cámara, F., Ciriotti, M.E., Nash, B.P., Balestra, C., Chiappino, L. (2016): Castellaroite, Mn2+3(AsO4)2⋅4.5H2O, a new mineral from Italy related to metaswitzerite. European Journal of Mineralogy, 28, 687-696.
Gabrielson, O. (1951) Manganiferous hoernesite and manganese-hoernesite from Långban, Sweden. Arkiv för Mineralogi och Geologi, 1 (11): 333-337; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
Parker, F. J. & Troy, J.: Min.Rec.:13:35-38 (1982); Dunn(1995):Pt5:673.