Shcherbakovite Mineral Data

Shcherbakovite Mineral Data +

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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

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 - DipyramidalH-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),

Crystal Structure:

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Uvarova Y A , Sokolova E V , Hawthorne F C , Liferovich R P , Mitchell R H , The Canadian Mineralogist , 41 (2003) p.1193-1201, The crystal chemistry of shcherbakovite from the Khibina Massif, Kola Peninsula, Russia, Locality: Khibina Massif, Kola Peninsula, Russia

Physical Properties of Shcherbakovite

Cleavage:

[???] Good, [???] Good

Color:

Dark brown, Reddish brown.

Density:

3.34

Diaphaniety:

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

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:

r_electron=3.02 gm/cc
note: r_{Shcherbakovite}=3.13 gm/cc.

Fermion Index

Fermion Index = 0.03459
Boson Index = 0.96541

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)

Estimated Radioactivity from Shcherbakovite - barely detectable

Shcherbakovite Classification

Dana Class:

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

(65.3)with chains P=4

(65.3.4)Batisite group

65.3.4.1 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2

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

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

Strunz Class:

VIII/F.25-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) Quadruplet chains [Si4O12]8-

VIII/F.25 - Batisite - Ohmilite series

VIII/F.25-10 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2

VIII/F.25-20 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m

VIII/F.25-30 Taikanite (Ba,Sr)2Mn2Si4O12 C 2 2

VIII/F.25-40 Krauskopfite BaSi2O4(OH)2·2(H2O) P 2₁/a 2/m

VIII/F.25-50 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)·2-3(H2O) P 2₁/m 2/m

Other Shcherbakovite Information

References:

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

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Shcherbakovite

KKNaTi2O(OH)[Si4O12]
Dana No: 65.3.4.2 Strunz No: VIII/F.25-20
Locality:

Notes: