Veblenite
Veblenite is an IMA-recognized mineral species in the silicate class, with the chemical formula K₂ ₂Na(Fe²⁺₅Fe³⁺₄Mn₇ )Nb₃Ti(Si₂O₇)₂(Si₈O₂₂)₂O₆(OH)₁₀(H₂O)₃.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: specific gravity 3.046; Very pale brown streak; Vitreous luster; optically biaxial.
IMA symbol Veb, IMA status: approved, named in 2010.
Included in feldspar in gneiss.
It is found associated with Niobophyllite, aegirine-augite, barylite, eudidymite, neptunite, Mn-rich pectolite, pyrochlore, sphalerite, galena.
The mineral was named to honor of David R. Veblen (b. 1947), Minneapolis, Minnesota, USA, in recognition of his outstanding contributions to the fields of mineralogy and crystallography.
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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