Lemmleinite-K Mineral Data

Lemmleinite-K Mineral Data
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General Lemmleinite-K Information

Help on Chemical Formula: Chemical Formula: NaK2(Ti,Nb)2Si4O12(O,OH)2•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: NaK2Ti1.4Nb0.6Si4O13.6(OH)0.4•2(H2O)
Help on Environment: Environment: Found in hyperagpaitic pegmatites. The Ti-dominant analogue of nenadkevichite.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Mount Koashava, Khibina alkaline massif, Kola Penninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Georgy G. Lemmlein (1901-1962), prominent Russian mineralogist and crystallographer.
Help on Synonym: Synonym: IMA1997-003
  IMA2000-A
  Lemmleinite
 

Lemmleinite-K Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =1.0352:1:0.5629
Help on Cell Dimensions: Cell Dimensions: a = 14.39, b = 13.9, c = 7.825, Z = 4; beta = 117.6° V = 1,387.05 Den(Calc)= 2.86
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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
Help on Forms: Forms:

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

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Click Here for Large Lemmleinite-K Structure Window 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

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.8
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Pseudo Orthorhombic - Crystals show an orthorhombic shape.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Lemmleinite-K

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.667, b=1.677, g=1.802, bire=0.1350
 

Calculated Properties of Lemmleinite-K

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Lemmleinite-K =2.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PELemmleinite-K = 17.42 barns/electron
U=PELemmleinite-K x relectron= 47.85 barns/cc.
Help on Radioactivity: 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
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( MinRec, v 32, p 216) PHYS. PROP.(MinRec, v 32, p 216) OPTIC PROP.(MinRec, v 32, p 216)
Help on See Also: 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: