Shkatulkalite Mineral Data

General Shkatulkalite Information

Chemical Formula:

{(Na,Mn,Ca,[ ])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[ ])

Composition:

Molecular Weight = 1,086.02 gm

Sodium 5.82 % Na

Calcium 0.92 % Ca

Manganese 5.06 % Mn

Niobium 17.11 % Nb

Silicon 10.34 % Si

Hydrogen 2.41 % H

Oxygen 57.46 % O

Fluorine 0.87 % F

______

100.00 %

Empirical Formula:

Na_2.75Mn²⁺Ca_0.25Nb₂O₃•(H₂O)(Si₂O₇)₂12(OH)_1.5F_0.5·3(H₂O)

Environment:

In hyperagpaitic pegmatites. Similar to epistolite and murmanite.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

Mount Alluaiv in the northwestern part of the Lovozero Alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

For the Shkatulka vein in which the mineral was found.

Name Pronunciation:

Shkatulkalite + Pronunciation

Synonym:

IMA1993-058

Shkatulkalite Image

Images:

Click Here for Larger Shkatulkalite Image

Shkatulkalite Manganoneptunite

Comments: Pearly white shkatulkalite with brown mangan-neptunite grains.
Location: Shkatulka pegmatite, Umbozero mine, Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Shkatulkalite Crystallography

Axial Ratios:

a:b:c =0.7615:1:4.3314

Cell Dimensions:

a = 5.468, b = 7.18, c = 31.1, Z = 1; beta = 94° V = 1,218.02 Den(Calc)= 1.48

Crystal System:

MonoclinicSpace Group: P 2,Pm,P 2/m

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

By Intensity(I/I_o): 3.11(1), 15.56(0.9), 2.665(0.7),2.85(0.7),

Physical Properties of Shkatulkalite

Cleavage:

{001} Perfect, {100} Perfect

Color:

Colorless, Silvery white, Light pink, Creamy, Yellowish.

Density:

2.7

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Micaceous - Platy texture with "flexible" plates.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Pearly

Streak:

white

Optical Properties of Shkatulkalite

Optical Data:

Biaxial (+), a=1.608, b=1.63, g=1.66, bire=0.0520, 2V(Calc)=84, 2V(Meas)=82. Dispersion r < v moderate.

Pleochroism (x):

none.

Pleochroism (y):

none.

Calculated Properties of Shkatulkalite

Electron Density:

Bulk Density (Electron Density)=1.47 gm/cc
note: Specific Gravity of Shkatulkalite =1.48 gm/cc.

Fermion Index:

Fermion Index = 0.0051227011
Boson Index = 0.9948772989

Photoelectric:

PE_{Shkatulkalite}= 26.30 barns/electron
U=PE_{Shkatulkalite} x rElectron Density= 38.76 barns/cc.

Radioactivity:

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

Shkatulkalite Classification

Dana Class:

56.02.07.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.02)with cations in [4] and/or >[4] coordination

(56.02.07)Murmanite group

56.02.07.01 Epistolite (Na,[])2{(Na,Ti)4[Nb2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 1

56.02.07.02 Murmanite (Na,[])2{(Na,Ti)4[Ti2(O,H2O)4Si4O14](OH,F)2}•2H2O P1 ? 1

56.02.07.03 Shkatulkalite! {(Na,Mn,Ca,[])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[]) P 2,Pm,P 2/m Mono

Strunz Class:

09.BE.50 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.50 Bornemanite BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}•PO4 I11b m

09.BE.50 Shkatulkalite! {(Na,Mn,Ca,[])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[]) P 2,Pm,P 2/m Mono

09.BE.50 Bykovaite! BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}•3H2O I11b 2

Other Shkatulkalite Information

See Also:

Links to other databases for Shkatulkalite :
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 Shkatulkalite Specimen Label here :

Shkatulkalite

{(Na,Mn,Ca,[ ])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[ ])
Dana No: 56.02.07.03 Strunz No: 09.BE.50
Locality:

Notes: