Lemmleinite-Ba Mineral Data
General Lemmleinite-Ba Information
Chemical Formula:
Na2K2Ba1-xTi4(Si4O12)2(O,OH)4•5(H2O)
Composition:
Molecular Weight = 2,498.97 gm
Potassium 5.79 % K 6.97 % K2 O
Barium 11.54 % Ba 12.88 % BaO
Sodium 3.96 % Na 5.33 % Na2 O
Magnesium 0.19 % Mg 0.32 % MgO
Titanium 15.14 % Ti 25.25 % TiO2
Manganese 1.32 % Mn 1.70 % MnO
Niobium 0.37 % Nb 0.53 % Nb2 O5
Iron 0.22 % Fe 0.29 % FeO
Silicon 17.98 % Si 38.47 % SiO2
Hydrogen 0.91 % H 8.15 % H2 O
Oxygen 42.58 % O
______ ______
100.00 % 99.90 % = TOTAL OXIDE
Empirical Formula:
Na4.3 K3.7 Ba2.1 Mn2+ 0.6 Mg0.2 Fe2+ 0.1 Ti7.9 Nb0.1 (Si4 O12 )4 O6.4 (OH)1.6 �10.5(H2 O)
Environment:
Alkaline pegmatites. Labuntsovite group, structure
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
Kukisvumchorr Mt, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named as the Ba-dominant member of the lemmleinite subgroup.
Synonym:
IMA1998-052a
Lemmleinite-Ba Image
Images:
Lemmleinite-Ba
Comments: Orange-brown pyramidal crystals of lemmleinite-Ba with greenish aegirine crystals.
Location: Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.
Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag
Lemmleinite-Ba Crystallography
Axial Ratios:
a:b:c =1.0335:1:0.5646
Cell Dimensions:
a = 14.216, b = 13.755, c = 7.767, Z = 1; beta = 116.7° V = 1,356.82 Den(Calc)= 3.06
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 3.16(1)(42 1,402 ), 6.31(0.28)(201 ), 6.93(0.26)(001),
2.577(0.25)(203 ,241), 3.02(0.25)(240), 3.55(0.24)(401 ), 3.09(0.24)(022,041),
Physical Properties of Lemmleinite-Ba
Cleavage:
{???} Imperfect
Color:
Bright orange, Reddish orange, Light coffee brown.
Density:
3.03
Diaphaneity:
Transparent
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Lemmleinite-Ba
Gladstone-Dale:
CI meas = 0.047 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = 0.057 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2389,KPDmeas = 0.2413,KC = 0.2532 Ncalc = 1.77
Optical Data:
Biaxial (+), a=1.683, b=1.69, g=1.82, bire=0.1370, 2V(Calc)=28, 2V(Meas)=37. Dispersion r > v medium.
Calculated Properties of Lemmleinite-Ba
Electron Density:
Bulk Density (Electron Density)=2.94 gm/cc note: Specific Gravity of Lemmleinite-Ba =3.03 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PELemmleinite-Ba = 52.53 barns/electronU=PELemmleinite-Ba x r electron = 154.34 barns/cc.
Radioactivity:
GRapi = 81.00 (Gamma Ray American Petroleum Institute Units)
Concentration of Lemmleinite-Ba per GRapi unit = 1.23 (%)
Estimated Radioactivity from Lemmleinite-Ba - barely detectable
Lemmleinite-Ba Classification
Dana Class:
60.01.03d.02 (60) Cyclosilicate Four-Membered Rings
(60.01) as Titanosilicates
(60.01.03d) Labuntsovite Group (Lemmleinite subgroup Monoclinic [C2/m])
60.01.03d.01 Lemmleinite-K ! NaK2(Ti,Nb)2Si4O12(O,OH)2•2(H2O) C 2/m 2/m
60.01.03d.02 Lemmleinite-Ba ! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4•5(H2O) C 2/m 2/m
Strunz Class:
09.CE.30d 09 - SILICATES (Germanates)
09.C - Cyclosilicates
09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),
09.CE.30d Lemmleinite-Ba ! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4•5(H2O) C 2/m 2/m
09.CE.30d Lemmleinite-K ! NaK2(Ti,Nb)2Si4O12(O,OH)2•2(H2O) C 2/m 2/m
Other Lemmleinite-Ba Information
References:
NAME( AmMin, v 87, p 1733) PHYS. PROP.(AmMin, v 87, p 1733) OPTIC PROP.(AmMin, v 87, p 1733)
See Also:
Links to other databases for Lemmleinite-Ba :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Lemmleinite-Ba
Na2K2Ba1-xTi4(Si4O12)2(O,OH)4•5(H2O)
Dana No: 60.01.03d.02 Strunz No: 09.CE.30d
Locality:
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