Lemmleinite-K Mineral Data

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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

Forms:

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Forms: ( 0 4 1) ( 1 0 0) ( 2 0 1)

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Crystal Structure:

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Rastsvetaeva R K , Arakcheeva A V , Khomyakov A P , Doklady Chemistry , 351 (1996) p.294-297, Crystal structure and microtwinning of a new monoclinic analog of, nenadkevichite, Locality: Khibiny alkaline massif, Kola Peninsula, Russia

Physical Properties of Lemmleinite-K

Cleavage:

None

Color:

Colorless.

Density:

2.8

Diaphaneity:

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
Ncalc = 1.72 - 1.73

Optical Data:

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

Calculated Properties of Lemmleinite-K

Electron Density:

Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Lemmleinite-K =2.80 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

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)
Concentration of Lemmleinite-K per GRapi unit = 0.54 (%)

Estimated Radioactivity from Lemmleinite-K - barely detectable

Lemmleinite-K Classification

Dana Class:

60.01.03d.01 (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-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 - 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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Print or Cut-and-Paste your Lemmleinite-K Specimen Label here :

Lemmleinite-K

NaK2(Ti,Nb)2Si4O12(O,OH)2•2(H2O)
Dana No: 60.01.03d.01 Strunz No: 09.CE.30d
Locality:

Notes: