Nabalamprophyllite
A sodium-barium member of the lamprophyllite group — its name literally encodes its Na-Ba chemistry.
Intro adapted from Wikipedia (CC BY-SA).
Nabalamprophyllite is an IMA-recognized mineral species in the silicate class, with the chemical formula (BaNa)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group P2/m). It is a member of the Seidozerite-Lamprophyllite structural group.
Key properties: Mohs hardness 3; refractive index 1.775; optically biaxial.
IMA symbol Nlmp, IMA status: approved, named in 2001.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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