Shcherbakovite Mineral Data

General Shcherbakovite Information

Chemical Formula:

KKNaTi2O(OH)[Si4O12]

Composition:

Molecular Weight = 568.26 gm

Potassium 11.42 % K 13.76 % K₂O

Barium 5.56 % Ba 6.21 % BaO

Sodium 4.33 % Na 5.84 % Na₂O

Titanium 11.80 % Ti 19.68 % TiO₂

Niobium 7.68 % Nb 10.99 % Nb₂O₅

Silicon 19.77 % Si 42.29 % SiO₂

Hydrogen 0.08 % H 0.73 % H₂O

Oxygen 39.36 % O

______ ______

100.00 % 99.49 % = TOTAL OXIDE

Empirical Formula:

K_0.66Ba_0.23Na_0.07KNaTi_1.4Nb_0.47O_1.52(OH)_0.46Si₄O₁₂

Environment:

Occurs in late hydrothermal shallowly dipping veins of natrolite. The K-dominant analog of batisite.

IMA Status:

Valid Species (Pre-IMA) 1954

Locality:

Mount Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Dmitrii Ivanovich Shcherbakov (1893-1966), Russian mineralogist and geochemist

Name Pronunciation:

Shcherbakovite + Pronunciation

Shcherbakovite Image

Images:

Shcherbakovite

Comments: Secondary electron image of a shcherbakovite crystal.
Location: Mount Rasvumchorr, Khibina massif, Kola Peninsula, Russia. Scale: See Image.
© Canadian Mineralogist

Shcherbakovite Crystallography

Axial Ratios:

a:b:c =0.7723:1:1.325

Cell Dimensions:

a = 8.1538, b = 10.5569, c = 13.9882, Z = 4; V = 1,204.09 Den(Calc)= 3.13

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: I mma

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

By Intensity(I/I_o): 2.9(1), 1.69(0.7), 2.64(0.7),

Physical Properties of Shcherbakovite

Cleavage:

{???} Good, {???} Good

Color:

Dark brown, Reddish brown.

Density:

3.34

Diaphaneity:

Translucent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Hardness:

6.5 - Pyrite

Luster:

Vitreous - Greasy

Streak:

rosey brown

Optical Properties of Shcherbakovite

Gladstone-Dale:

CI meas= 0.087 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2369,KPDmeas= 0.222,KC= 0.2432
Ncalc = 1.76 - 1.81

Optical Data:

Biaxial (-), a=1.707-1.714, b=1.745-1.746, g=1.765-1.772, bire=0.0580, 2V(Calc)=70-82, 2V(Meas)=64-90. Dispersion r < v distinct.

Pleochroism (x):

colorless or pale yellow.

Pleochroism (y):

yellow or yellow.

Pleochroism (z):

golden yellow or brownish yellow.

Calculated Properties of Shcherbakovite

Electron Density:

Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Shcherbakovite =3.13 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Shcherbakovite}= 38.26 barns/electron
U=PE_{Shcherbakovite} x r_electron= 115.72 barns/cc.

Radioactivity:

GRapi = 159.26 (Gamma Ray American Petroleum Institute Units)
Concentration of Shcherbakovite per GRapi unit = 0.63 (%)

Estimated Radioactivity from Shcherbakovite - barely detectable

Shcherbakovite Classification

Dana Class:

65.03.04.02 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.03)with chains P=4

(65.03.04)Batisite group

65.03.04.01 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2

65.03.04.02 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m

65.03.04.03 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)•2-3(H2O) P 2₁/m 2/m

Strunz Class:

09.DH.20 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.20 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2

09.DH.20 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m

Other Shcherbakovite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, CanMin 41:1193) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Shcherbakovite :
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

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Shcherbakovite

KKNaTi2O(OH)[Si4O12]
Dana No: 65.03.04.02 Strunz No: 09.DH.20
Locality:

Notes:

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