Barytolamprophyllite
Barytolamprophyllite is an IMA-recognized mineral species in the silicate class, with the chemical formula (BaK)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Seidozerite-Lamprophyllite structural group.
Key properties: Mohs hardness 2–3; specific gravity 3.62–3.66; Vitreous luster; optically biaxial.
IMA symbol Blmp, IMA status: approved, named in 1959.
Found in ijolite (Lovozero massif, Russia).
It is found associated with Aegirine, nepheline, potassic feldspar, cancrinite, apatite (Lovozero massif, Russia); amphibole, eudialyte, natrolite, pectolite (Gardiner complex, Greenland).
The name refers to the BARium in its composition and its relation to lamprophyllite.
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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