Lepkhenelmite-Zn Mineral Data

Lepkhenelmite-Zn Mineral Data

General Lepkhenelmite-Zn Information

Chemical Formula:

Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O)

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

Empirical Formula:

Ba_0.91K_0.53Ca_0.26Na_0.24Sr_0.22Zn_0.57Mn²⁺_0.14Fe²⁺_0.04Mg_0.01Ti_2.94Nb_1.01Si_7.8Al_0.1O₂₄ O_1.38(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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Lepkhenelmite-Zn Crystallography

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

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

By Intensity(I/I_o): 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

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

Optical Properties of Lepkhenelmite-Zn

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.

Calculated Properties of Lepkhenelmite-Zn

Electron Density:

r_electron=2.87 gm/cc
note: r_{Lepkhenelmite-Zn}=2.96 gm/cc.

Fermion Index

Fermion Index = 0.04277
Boson Index = 0.95723

Photoelectric:

PE_{Lepkhenelmite-Zn}= 57.94 barns/electron
U=PE_{Lepkhenelmite-Zn} x r_electron= 166.45 barns/cc.

Radioactivity:

GRapi = 23.02 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lepkhenelmite-Zn - barely detectable

Lepkhenelmite-Zn Classification

Dana Class:

60.1.3c.4 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.3c)Labuntsovite Group (Kuzmenkoite subgroup Monoclinic [C2/m])

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

60.1.3c.2 Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m

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

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

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.07 - Labuntsovite Group

VIII/E.07-10 Korobitsynite! Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-20 Nenadkevichite (Na,Ca,K)(Nb,Ti)Si2O6(O,OH)·2(H2O) Pbam 2/m 2/m 2/m

VIII/E.07-30* Strontiochevkinite (Sr,REE)4Fe(Ti,Zr)2Ti2Si4O22 C 2/a 2/m

VIII/E.07-30 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2·3(H2O) Cm m

VIII/E.07-32 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O) Cm m

VIII/E.07-33 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O) C 2/m 2/m

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

VIII/E.07-40 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O) Cm m

VIII/E.07-50 Clinophosinaite! Na3CaPSiO7 P 2/c 2/m

VIII/E.07-50* Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8(H2O) Cm m

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

VIII/E.07-60 Phosinaite-(Ce)! Na13Ca2Ce[Si4O12](PO4)4 P 22121 2 2 2

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

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

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

VIII/E.07-100 Lemmleinite-K! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m

VIII/E.07-110 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m

VIII/E.07-130 Paralabuntsovite-Mg! Na8K8Mg8Ti16(Si4O12)8(O,OH)16·n(H2O) I2/m 2/m

VIII/E.07-140 Labuntsovite-Mg! Na4K4(Ba,K)(Mg,Fe)1xTi8(Si4O12)4(O,OH)8·10(H2O) C 2/m 2/m

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

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

VIII/E.07-170 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) C 2/m 2/m

VIII/E.07-180 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) C 2/m 2/m

VIII/E.07-190 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-200 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4·5(H2O) Cm m

VIII/E.07-205 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4·6(H2O) Cm m

VIII/E.07-210 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

VIII/E.07-220 Lepkhenelmite-Zn Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4·7(H2O) Cm m

Other Lepkhenelmite-Zn Information

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 :

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: