Lemmleinite-K Mineral Data

Lemmleinite-K Mineral Data

General Lemmleinite-K Information

Chemical Formula:

NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O)

Composition:

Molecular Weight = 596.73 gm

Potassium 13.10 % K 15.79 % K₂O

Sodium 3.85 % Na 5.19 % Na₂O

Titanium 11.23 % Ti 18.74 % TiO₂

Niobium 9.34 % Nb 13.36 % Nb₂O₅

Silicon 18.83 % Si 40.28 % SiO₂

Hydrogen 0.74 % H 6.64 % H₂O

Oxygen 42.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaK₂Ti_1.4Nb_0.6Si₄O_13.6(OH)_0.4·2(H₂O)

Environment:

Found in hyperagpaitic pegmatites. The Ti-dominant analogue of nenadkevichite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Mount Koashava, Khibina alkaline massif, Kola Penninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Georgy G. Lemmlein (1901-1962), prominent Russian mineralogist and crystallographer.

Synonym:

IMA1997-003

IMA2000-A

Lemmleinite

Lemmleinite-K Image

Images:

Lemmleinite-K

Comments: Transparent, pyramidal crystals of lemmleinite-K on matrix.
Location: Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Lemmleinite-K Crystallography

Axial Ratios:

a:b:c =1.0352:1:0.5629

Cell Dimensions:

a = 14.39, b = 13.9, c = 7.825, Z = 4; beta = 117.6° V = 1,387.05 Den(Calc)= 2.86

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.186(1)(402,421,400), 3.1(0.96)(041,022), 6.94(0.61)(020), 6.39(0.43)(201,200), 2.586(0.28)(241,202), 2.6(0.28)(242,203), 2.489(0.24)(40

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Forms: [ 0 4 1] [ 1 0 0] [ 2 0 1]

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Physical Properties of Lemmleinite-K

Cleavage:

None

Color:

Colorless.

Density:

2.8

Diaphaniety:

Transparent to translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Pseudo Orthorhombic - Crystals show an orthorhombic shape.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lemmleinite-K

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2501,KPDmeas= 0.2555,KC= 0.2566

Optical Data:

Biaxial (+), a=1.667, b=1.677, g=1.802, bire=0.1350

Calculated Properties of Lemmleinite-K

Electron Density:

r_electron=2.75 gm/cc
note: r_{Lemmleinite-K}=2.80 gm/cc.

Fermion Index

Fermion Index = 0.02353
Boson Index = 0.97647

Photoelectric:

PE_{Lemmleinite-K}= 17.42 barns/electron
U=PE_{Lemmleinite-K} x r_electron= 47.85 barns/cc.

Radioactivity:

GRapi = 185.57 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lemmleinite-K - barely detectable

Lemmleinite-K Classification

Dana Class:

60.1.3d.1 (60)Cyclosilicate Four-Membered Rings

(60.1)as Titanosilicates

(60.1.3d)Labuntsovite Group (Lemmleinite subgroup Monoclinic [C2/m])

60.1.3d.1 Lemmleinite-K ! NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O) C 2/m 2/m

60.1.3d.2 Lemmleinite-Ba! Na2K2Ba1-xTi4(Si4O12)2(O,OH)4·5(H2O) C 2/m 2/m

Strunz Class:

VIII/E.07-100 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 Lemmleinite-K Information

References:

NAME( MinRec, v 32, p 216) PHYS. PROP.(MinRec, v 32, p 216) OPTIC PROP.(MinRec, v 32, p 216)

See Also:

Links to other databases for Lemmleinite-K :
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 Lemmleinite-K Specimen Label here :

Lemmleinite-K

NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O)
Dana No: 60.1.3d.1 Strunz No: VIII/E.07-100
Locality:

Notes: