Devitoite
Devitoite is an IMA-recognized mineral species in the silicate class, with the chemical formula Ba₆Fe²⁺₇Fe³⁺₂(Si₄O₁₂)₂(PO₄)₂(CO₃)O₂(OH)₄.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Astrophyllite-Devitoite structural group.
Key properties: Mohs hardness 4; specific gravity 4.044; Cream to pale brown streak; Silky luster; optically biaxial.
IMA symbol Dvt, IMA status: approved, named in 2009.
An alteration product of gillepsite along fractures and parting planes in a sanbornite- bearing rock.
It is found associated with Gillespite, titantaramellite, celsian, sanbornite, anandite, quartz, the Fe2+ analogue of ericssonite (California); gillespite, titantaramellite.
The mineral was named to honor Alfred (Fred) Devito (1937–2004) a prominent mineral collector (micromounts), field collector and contributor to the California mineralogical community.