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 % K₂O

Barium 11.54 % Ba 12.88 % BaO

Sodium 3.96 % Na 5.33 % Na₂O

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 % Nb₂O₅

Iron 0.22 % Fe 0.29 % FeO

Silicon 17.98 % Si 38.47 % SiO₂

Hydrogen 0.91 % H 8.15 % H₂O

Oxygen 42.58 % O

______ ______

100.00 % 99.90 % = TOTAL OXIDE

Empirical Formula:

Na_4.3K_3.7Ba_2.1Mn²⁺_0.6Mg_0.2Fe²⁺_0.1Ti_7.9Nb_0.1(Si₄O₁₂)₄O_6.4(OH)_1.6ï¿½10.5(H₂O)

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.16(1)(421,402), 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:

PE_{Lemmleinite-Ba}= 52.53 barns/electron
U=PE_{Lemmleinite-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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