General Lepkhenelmite-Zn Information
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Chemical Formula: |
Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) |
Composition: |
Molecular Weight = 1,261.08 gm |
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Potassium 1.64 % K 1.98 % K2O |
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Barium 9.91 % Ba 11.06 % BaO |
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Sodium 0.44 % Na 0.59 % Na2O |
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Strontium 1.53 % Sr 1.81 % SrO |
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Calcium 0.83 % Ca 1.16 % CaO |
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Magnesium 0.02 % Mg 0.03 % MgO |
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Titanium 11.16 % Ti 18.62 % TiO2 |
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Manganese 0.61 % Mn 0.79 % MnO |
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Niobium 7.44 % Nb 10.64 % Nb2O5 |
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Aluminum 0.21 % Al 0.40 % Al2O3 |
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Zinc 2.96 % Zn 3.68 % ZnO |
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Iron 0.18 % Fe 0.23 % FeO |
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Silicon 17.37 % Si 37.16 % SiO2 |
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Hydrogen 1.33 % H 11.84 % H2O |
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Oxygen 44.38 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
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) |
Environment: |
A hydrothermal mineral in cavities of a eudialyte - aegirine - feldspar pegmatite. Kuzmenkoite subgroup with dominance of Zn in the D structural site. |
IMA Status: |
Approved IMA 2003 (Dana # Added) |
Locality: |
Lepkhe-Nelm Mountain, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
Name Origin: |
Named after the locality and composition. |
Synonym: |
IMA2003-003 |
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Images:
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Lepkhenelmite-Zn Crystallography
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Axial Ratios: |
a:b:c =1.0354:1:0.561 |
Cell Dimensions: |
a = 14.381, b = 13.889, c = 7.793, Z = 2; beta = 117.52° V = 1,380.43 Den(Calc)= 3.03 |
Crystal System: |
Monoclinic - DomaticH-M Symbol (m) Space Group: Cm |
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) |
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Physical Properties of Lepkhenelmite-Zn
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Cleavage: |
None |
Color: |
Pale brown. |
Density: |
2.96 |
Diaphaniety: |
Transparent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
5 - Apatite |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Lepkhenelmite-Zn
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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 |
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. |
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Calculated Properties of Lepkhenelmite-Zn
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Electron Density: |
relectron=2.87 gm/cc note: rLepkhenelmite-Zn =2.96 gm/cc. |
Fermion Index |
Fermion Index = 0.04277 Boson Index = 0.95723 |
Photoelectric: |
PELepkhenelmite-Zn = 57.94 barns/electron U=PELepkhenelmite-Zn x relectron= 166.45 barns/cc. |
Radioactivity: |
GRapi = 23.02 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Lepkhenelmite-Zn - barely detectable
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Lepkhenelmite-Zn Classification
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Dana Class: |
60.1.3c.4 (60)Cyclosilicate Four-Membered Rings |
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(60.1)as Titanosilicates |
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(60.1.3c)Labuntsovite Group (Kuzmenkoite subgroup Monoclinic [C2/m]) |
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60.1.3c.1 Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m |
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60.1.3c.2 Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m |
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60.1.3c.3 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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60.1.3c.4 Lepkhenelmite-Zn ! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
Strunz Class: |
VIII/E.07-220 VIII - Silicates |
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VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8- |
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VIII/E.07 - Labuntsovite Group |
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VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m |
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VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m |
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VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m |
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VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m |
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VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m |
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VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m |
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VIII/E.07-34 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m |
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VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m |
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VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m |
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VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m |
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VIII/E.07-60* Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4·5(H2O) C 2/m 2/m |
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VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2 |
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VIII/E.07-70 Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]·4(H2O) C 2/m 2/m |
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VIII/E.07-80 Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m |
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VIII/E.07-90 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m |
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VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m |
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VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m |
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VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m |
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VIII/E.07-150 Labuntsovite-Fe! Na4K4(Ba,K)2(Fe,Mg,Mn)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m |
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VIII/E.07-155 Labuntsovite-Mn Na4K4(Ba,K)(Mn,Fe)1x(Ti,Nb)8[Si4O12]4(O,OH)8·n(H2O),n=10-12 I2/m 2/m |
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VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m |
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VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m |
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VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m |
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VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m |
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VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m |
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VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
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VIII/E.07-220 Lepkhenelmite-Zn Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m |
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Other Lepkhenelmite-Zn Information
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References: |
NAME( CanMin, 42:1913) PHYS. PROP.(CanMin, 42:1913) OPTIC PROP.(CanMin, 42:1913) |
See Also: |
Links to other databases for Lepkhenelmite-Zn :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
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Print or Cut-and-Paste your Lepkhenelmite-Zn Specimen Label here :
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Lepkhenelmite-Zn
Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O)
Dana No: 60.1.3c.4 Strunz No: VIII/E.07-220
Locality:
Notes:
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