Lovdarite Mineral Data

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General Lovdarite Information

Chemical Formula:

K2Na6Be4Si14O36•9(H2O)

Composition:

Molecular Weight = 1,466.77 gm

Potassium 5.28 % K 6.36 % K₂O

Barium 0.19 % Ba 0.21 % BaO

Sodium 11.27 % Na 15.19 % Na₂O

Calcium 0.36 % Ca 0.50 % CaO

Magnesium 0.03 % Mg 0.05 % MgO

Titanium 0.07 % Ti 0.11 % TiO₂

Beryllium 2.53 % Be 7.01 % BeO

Aluminum 0.96 % Al 1.81 % Al₂O₃

Iron 0.08 % Fe 0.11 % Fe₂O₃

Silicon 26.67 % Si 57.06 % SiO₂

Phosphorus 0.04 % P 0.10 % P₂O₅

Hydrogen 1.28 % H 11.46 % H₂O

Oxygen 51.26 % O

______ ______

100.00 % 99.96 % = TOTAL OXIDE

Empirical Formula:

K_1.98Na_7.19Ca_0.13Ba_0.02Be_4.11Al_0.47Ti_0.02Fe³⁺_0.02Mg_0.02Si_13.93Al_0.05P_0.02O_37.66·9.33(H₂O)

Environment:

A late hydrothermal mineral in alkalic pegmatites in a differentiated alkalic massif.

IMA Status:

Approved IMA 1973

Locality:

From the Jubilee pegmatite, Mt. Karnasurt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

From the Russian phrase "dar Lovozera", for a gift of Lovozero.

Name Pronunciation:

Lovdarite + Pronunciation

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)= 2.48

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

Diaphaneity:

Transparent to Translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Sometimes Fluorescent, Short UV=bright green.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lovdarite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2079,KPDmeas= 0.2213,KC= 0.2219
Ncalc = 1.52 - 1.55

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:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Lovdarite =2.33 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Lovdarite= 2.63 barns/electron
U=PE_Lovdarite x r_electron= 6.14 barns/cc.

Radioactivity:

GRapi = 76.28 (Gamma Ray American Petroleum Institute Units)
Concentration of Lovdarite per GRapi unit = 1.31 (%)

Estimated Radioactivity from Lovdarite - barely detectable

Lovdarite Classification

Dana Class:

78.06.02.01 (78)Unclassified silicates

(78.06)possible tectosilicates

(78.06.02)Dana Group

78.06.02.01 Lovdarite K2Na6Be4Si14O36•9(H2O) Pma2 mm2

Strunz Class:

09.GF.15 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GF -Other Rare Zeolites

09.GF.15 Lovdarite K2Na6Be4Si14O36•9(H2O) Pma2 mm2

Other Lovdarite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Lovdarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
16 - Zeolite Database by Bruno Herreros

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

Lovdarite

K2Na6Be4Si14O36•9(H2O)
Dana No: 78.06.02.01 Strunz No: 09.GF.15
Locality:

Notes: