Nabesite Mineral Data

General Nabesite Information

Chemical Formula:

Na2BeSi4O10•4(H2O)

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

Empirical Formula:

Na_1.75BeSi₄O₁₀•3.9(H₂O)

Environment:

Albite-lined cavities in within tugtupite-bearing albitites. 4-membered and 8-membered silicate rings; zeolite structure and is related to weinebeneite.

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Kvanefjeld Plateau, in the northwesternmost part of the Ilï¿½maussaq alkaline complex, South Greenland. Link to MinDat.org Location Data.

Name Origin:

Named after the elements in its composition, Natrium (Na), Beryllium (Be), and Silicon (Si).

Synonym:

IMA2000-024

Nabesite Image

Images:

Nabesite

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

Nabesite Crystallography

Axial Ratios:

a:b:c =0.9585:1:1.1861

Cell Dimensions:

a = 9.722, b = 10.142, c = 12.03, Z = 4; V = 1,186.16 Den(Calc)= 2.19

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/I_o): 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),

Forms:

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

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Physical Properties of Nabesite

Cleavage:

{110} Good, {001} Good

Color:

Colorless, White.

Density:

2.16

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Thin - Flat dimensioned crystals.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Nabesite

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

Optical Data:

Biaxial (-), a=1.499, b=1.507, g=1.511, bire=0.0120

Calculated Properties of Nabesite

Electron Density:

Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Nabesite =2.19 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Nabesite= 1.33 barns/electron
U=PE_Nabesite x rElectron Density= 2.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nabesite is Not Radioactive

Nabesite Classification

Dana Class:

77.01.05.11 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.05)Natrolite and related species

77.01.05.01 Natrolite Na2[Al2Si3O10]•2(H2O) F dd2 mm2

77.01.05.02 Tetranatrolite? Na2[Al2Si3O10]•2(H2O) I 42d 4 2m

77.01.05.03 Paranatrolite Na2[Al2Si3O10]•3(H2O) Cc m

77.01.05.04 Mesolite Na2Ca2Al6Si9O30•8(H2O) C 2 2

77.01.05.05 Scolecite CaAl2Si3O10•3(H2O) Cc m

77.01.05.06 Edingtonite BaAl2Si3O10•4(H2O) P 2₁2₁2 2 2 2

77.01.05.07 Gonnardite Na2CaAl4Si6O20•7(H2O) I 42d 4 2m

77.01.05.08 Cowlesite CaAl2Si3O10•5-6(H2O) P 222₁, P mmm, Pmm2 Ortho

77.01.05.09 Thomsonite-Ca NaCa2Al5Si5O20•6(H2O) Pncn 2/m 2/m 2/m

77.01.05.10 Thomsonite-Sr! (Sr,Ca)2Na[Al5Si5O20]•7(H2O) Pcnn 2/m 2/m 2/m

77.01.05.11 Nabesite! Na2BeSi4O10•4(H2O) P 2₁2₁2₁ 2 2 2

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

References:

NAME( AmMin, Vol 88, p 252) PHYS. PROP.(AmMin, Vol 88, p 252) OPTIC PROP.(AmMin, Vol 88, p 252)

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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Nabesite

Na2BeSi4O10•4(H2O)
Dana No: 77.01.05.11 Strunz No: 09.EA.65
Locality:

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