General Information:
Chemical Formula:
BaNa4Ti2NbSi4O17(F,OH)·Na3PO4
Composition:
(Molecular Weight = 984.23 gm)
Barium 13.95 % Ba
Sodium 16.35 % Na
Titanium 9.73 % Ti
Niobium 9.44 % Nb
Silicon 11.41 % Si
Phosphorus 3.15 % P
Hydrogen 0.05 % H
Oxygen 34.95 % O
Fluorine 0.97 % F
Empirical Formula:
BaNa7Ti2NbSi4O17F0.5(OH)0.5(PO4)
Environment:
Late hydrothermal mineral.
IMA Status:
Approved IMA 1975
Locality:
Yubileinaya (Jubilee) alkalic pegmatite, Mt. Karnarsut, Lovozero massif, Kola Peninsula, Russia.
Name Origin:
Named or Irina Dimitrievna Borneman-Starynkevich (1890-), Russian mineralogist, Institute of Ore Deposits, Moscow. She was a student of the mineralogy of the Khibiny and Lovozero ma ssifs.
Physical Properties:
Cleavage:
[001] Perfect
Color:
light yellow.
Density:
3.47 - 3.5, Average = 3.48
Diaphaniety:
Transparent to Translucent
Habits:
Platy - Sheet forms (e.g. micas)., Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
3.5-4 - Copper Penny-Flourite
Luster:
Pearly
Streak:
white
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