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Lepkhenelmite-Zn Mineral Data

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General Lepkhenelmite-Zn Information

Help on Chemical  Formula: Chemical Formula: Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)
Help on Composition: Composition: Molecular Weight = 1,261.08 gm
   Potassium   1.64 %  K     1.98 % K2O
   Barium      9.91 %  Ba   11.06 % BaO
   Sodium      0.44 %  Na    0.59 % Na2O
   Strontium   1.53 %  Sr    1.81 % SrO
   Calcium     0.83 %  Ca    1.16 % CaO
   Magnesium   0.02 %  Mg    0.03 % MgO
   Titanium   11.16 %  Ti   18.62 % TiO2
   Manganese   0.61 %  Mn    0.79 % MnO
   Niobium     7.44 %  Nb   10.64 % Nb2O5
   Aluminum    0.21 %  Al    0.40 % Al2O3
   Zinc        2.96 %  Zn    3.68 % ZnO
   Iron        0.18 %  Fe    0.23 % FeO
   Silicon    17.37 %  Si   37.16 % SiO2
   Hydrogen    1.33 %  H    11.84 % H2O
   Oxygen     44.38 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ba0.91K0.53Ca0.26Na0.24Sr0.22Zn0.57Mn2+0.14Fe2+0.04Mg0.01Ti2.94Nb1.01Si7.8Al0.1O24 O1.38(OH)2.62�6.98(H2O)
Help on Environment: Environment: A hydrothermal mineral in cavities of a eudialyte - aegirine - feldspar pegmatite. Kuzmenkoite subgroup with dominance of Zn in the D structural site.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Lepkhe-Nelm Mountain, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality and composition.
Help on Synonym: Synonym: IMA2003-003

Lepkhenelmite-Zn Image

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Comments: B&W image of fragments of lepkhenelmite-Zn.
Location: Lepkhe-Nel'm Mt., Lovozero, Kola, Russia. Scale: See Image.
© Diederik Visser

Lepkhenelmite-Zn Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0354:1:0.561
Help on Cell Dimensions: Cell Dimensions: a = 14.381, b = 13.889, c = 7.793, Z = 2; beta = 117.52° V = 1,380.43 Den(Calc)= 3.03
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.194(1)(421,402,400), 6.39(1)(201,200), 3.05(0.8)(241,240), 2.585(0.6)(242,241), 2.906(0.6)(422,420), 4.912(0.6)(021), 6.95(0.37)(020,001), 3.101(0.22)(041,022)

Physical Properties of Lepkhenelmite-Zn

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale brown.
Help on Density: Density: 2.96
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Lepkhenelmite-Zn

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2387,KPDmeas= 0.2444,KC= 0.2522
Ncalc = 1.75 - 1.76
Help on Optical Data: Optical Data: Biaxial (+), a=1.683, b=1.692, g=1.795, bire=0.1120, 2V(Calc)=36, 2V(Meas)=30. Dispersion dispersion not observed.

Calculated Properties of Lepkhenelmite-Zn

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Lepkhenelmite-Zn =2.96 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PELepkhenelmite-Zn = 57.94 barns/electron
U=PELepkhenelmite-Zn x relectron= 166.45 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 23.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Lepkhenelmite-Zn per GRapi unit = 4.34 (%)

Estimated Radioactivity from Lepkhenelmite-Zn - barely detectable


Lepkhenelmite-Zn Classification

Help on  Dana Class: Dana Class: 60.01.03c.04 (60)Cyclosilicate Four-Membered Rings
  (60.01)as Titanosilicates
  (60.01.03c)Labuntsovite Group (Kuzmenkoite subgroup Monoclinic [C2/m])
60.01.03c.01 Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m
60.01.03c.02 Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m
60.01.03c.03 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m
60.01.03c.04 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m
Help on  Strunz Class: Strunz Class: 09.CE.30c 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),
09.CE.30c Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m
09.CE.30c Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m
09.CE.30c Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m
09.CE.30c Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m
09.CE.30c Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O) C 2/m 2/m
09.CE.30c Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m
09.CE.30c Gjerdingenite-Ca! K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O C 2/m 2/m
09.CE.30c Gjerdingenite-Na! (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O C 2/m 2/m
09.CE.30c Burovaite-Ca! (K,Na)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8•12H2O C 2/m 2/m

Other Lepkhenelmite-Zn Information

Help on References: References: NAME( CanMin, 42:1913) PHYS. PROP.(CanMin, 42:1913) OPTIC PROP.(CanMin, 42:1913)
Help on See Also: See Also: Links to other databases for Lepkhenelmite-Zn :
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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Dana No: 60.01.03c.04 Strunz No: 09.CE.30c





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