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Nabesite Mineral Data

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General Nabesite Information

Help on Chemical  Formula: Chemical Formula: Na2BeSi4O10•4(H2O)
Help on Composition: Composition: Molecular Weight = 391.84 gm
   Sodium     10.27 %  Na   13.84 % Na2O
   Beryllium   2.30 %  Be    6.38 % BeO
   Silicon    28.67 %  Si   61.34 % SiO2
   Hydrogen    2.01 %  H    17.93 % H2O
   Oxygen     56.76 %  O
             ______        ______ 
             100.00 %       99.49 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.75BeSi4O10•3.9(H2O)
Help on Environment: Environment: Albite-lined cavities in within tugtupite-bearing albitites. 4-membered and 8-membered silicate rings; zeolite structure and is related to weinebeneite.
Help on IMA Status: IMA Status: Approved IMA 2000 (Dana # Added)
Help on Locality: Locality: Kvanefjeld Plateau, in the northwesternmost part of the Il�maussaq alkaline complex, South Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the elements in its composition, Natrium (Na), Beryllium (Be), and Silicon (Si).
Help on Synonym: Synonym: IMA2000-024

Nabesite Image

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Comments: White, tabular crystals of nabesite.
Location: Kvanefjeld plateau, Ilímaussaq massif, Greenland. Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag

Nabesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9585:1:1.1861
Help on Cell Dimensions: Cell Dimensions: a = 9.722, b = 10.142, c = 12.03, Z = 4; V = 1,186.16 Den(Calc)= 2.19
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 212121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.97(1)(002), 6.11(0.8)(111), 3.09(0.7)(310,131),2.988(0.6)(311), 3.06(0.5)(222,004), 3.46(0.45), 5.07(0.35),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 0 1 0) ( 0 0 1)

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Physical Properties of Nabesite

Help on Cleavage: Cleavage: {110} Good, {001} Good
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.16
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Thin - Flat dimensioned crystals.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Nabesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2309,KPDmeas= 0.2341,KC= 0.2302
Ncalc = 1.5
Help on Optical Data: Optical Data: Biaxial (-), a=1.499, b=1.507, g=1.511, bire=0.0120

Calculated Properties of Nabesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Nabesite =2.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PENabesite = 1.33 barns/electron
U=PENabesite x rElectron Density= 2.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nabesite is Not Radioactive

Nabesite Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.05)Natrolite and related species Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2 Scolecite CaAl2Si3O10•3(H2O) Cc m Edingtonite BaAl2Si3O10•4(H2O) P 21212 2 2 2 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m Cowlesite CaAl2Si3O10•5-6(H2O) P 2221, P mmm, Pmm2 Ortho Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]•7(H2O) Pcnn 2/m 2/m 2/m Nabesite! Na2BeSi4O10•4(H2O) P 212121 2 2 2
Help on  Strunz Class: Strunz Class: 09.EA.65 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
09.EA.65 Nabesite! Na2BeSi4O10•4(H2O) P 212121 2 2 2

Other Nabesite Information

Help on References: References: NAME( AmMin, Vol 88, p 252) PHYS. PROP.(AmMin, Vol 88, p 252) OPTIC PROP.(AmMin, Vol 88, p 252)
Help on See Also: See Also: Links to other databases for Nabesite :
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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Dana No: Strunz No: 09.EA.65





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