Lovdarite Mineral Data

Lovdarite Mineral Data +

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General Lovdarite Information

Chemical Formula:

K2Na6Be4Si14O36·9(H2O)

Composition:

Molecular Weight = 1,383.50 gm

Potassium 5.65 % K 6.81 % K₂O

Sodium 9.97 % Na 13.44 % Na₂O

Beryllium 2.61 % Be 7.23 % BeO

Silicon 28.42 % Si 60.80 % SiO₂

Hydrogen 1.31 % H 11.72 % H₂O

Oxygen 52.04 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Na₆Be₄(Si₁₄O₃₆)·9(H₂O)

IMA Status:

Approved IMA 1973

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 69408

PDF 39-1367

Lovdarite Image

Images:

Lovdarite

Comments: Bright white crystal sprays of lovdarite on fine-grained white natrolite.
Location: Yubileinaya Pegmatite, Mount Karnasurt, Lovozero Massif, Kola Peninsula, Murmansk, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lovdarite Crystallography

Axial Ratios:

a:b:c =5.7101:1:1.032

Cell Dimensions:

a = 39.576, b = 6.9308, c = 7.1526, Z = 2; V = 1,961.91 Den(Calc)= 2.34

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pma2

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

By Intensity(I/I_o): 3.136(1), 3.288(1), 4.96(0.9),

Crystal Structure:

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Merlino S , European Journal of Mineralogy , 2 (1990) p.809-817, Lovdarite, K4Na12(Be8Si28O72).18H2O, a zeolite-like mineral:, structural features and OD character

Physical Properties of Lovdarite

Cleavage:

[100] Distinct, [010] Distinct, [001] Distinct

Color:

Colorless, Yellow, Yellowish white, White.

Density:

2.33

Diaphaniety:

Transparent to Translucent

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lovdarite

Gladstone-Dale:

CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2204,KPDmeas= 0.2213,KC= 0.2225

Optical Data:

Biaxial (+), a=1.513, b=1.516, g=1.518, bire=0.0050, 2V(Calc)=78, 2V(Meas)=90.

Calculated Properties of Lovdarite

Electron Density:

r_electron=2.34 gm/cc
note: r_Lovdarite=2.33 gm/cc.

Fermion Index

Fermion Index = 0.03958
Boson Index = 0.96042

Photoelectric:

PE_Lovdarite= 1.86 barns/electron
U=PE_Lovdarite x r_electron= 4.34 barns/cc.

Radioactivity:

GRapi = 81.84 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Lovdarite - barely detectable

Lovdarite Classification

Dana Class:

78.6.2.1 (78)Unclassified silicates

(78.6)possible tectosilicates

(78.6.2)Dana Group

78.6.2.1 Lovdarite K2Na6Be4Si14O36·9(H2O) Pma2 mm2

Strunz Class:

VIII/J.17-10 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.17 - Lovdarite series

VIII/J.17-05 Nabesite! Na2BeSi4O10·4(H2O) P 2₁2₁2₁ 2 2 2

VIII/J.17-10 Lovdarite K2Na6Be4Si14O36·9(H2O) Pma2 mm2

VIII/J.17-20 Gaultite Na4Zn2Si7O18·5(H2O) F2dd mm2

Other Lovdarite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Lovdarite Specimen Label here :

Lovdarite

K2Na6Be4Si14O36·9(H2O)
Dana No: 78.6.2.1 Strunz No: VIII/J.17-10
Locality:

Notes: