Alfredstelznerite
Alfredstelznerite is an IMA-recognized mineral species in the borate class, with the chemical formula Ca₄(H₂O)₄[B₄O₄(OH)₆]₄(H₂O)₁₅.
It crystallizes in the orthorhombic crystal system (space group Pca2_1).
Key properties: Mohs hardness 2; specific gravity 1.77; White streak; Vitreous; silky in aggregates luster; optically biaxial.
IMA symbol Asz, IMA status: approved, named in 2007.
Found as a secondary mineral in a cavity in fractured mudstone in a playa-hosted borate deposit.
It is found associated with Colemanite, hydroboracite, ulexite, inyoite, gypsum, anhydrite.
The mineral was named to honor Dr. Alfred Wilhelm Stelzner (1840–1895), first professor of geology at the University of Córdoba and founder of the Mineralogical Museum.
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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