Vinogradovite Mineral Data

General Vinogradovite Information

Chemical Formula:

(Na,K)4Ti4(Si,Al)8O26•3(H2O,Na)

Composition:

Molecular Weight = 976.77 gm

Potassium 1.20 % K 1.45 % K₂O

Barium 1.41 % Ba 1.57 % BaO

Sodium 9.89 % Na 13.33 % Na₂O

Titanium 18.14 % Ti 30.26 % TiO₂

Niobium 0.95 % Nb 1.36 % Nb₂O₅

Aluminum 3.87 % Al 7.31 % Al₂O₃

Iron 1.14 % Fe 1.63 % Fe₂O₃

Silicon 18.98 % Si 40.60 % SiO₂

Hydrogen 0.21 % H 1.84 % H₂O

Oxygen 44.23 % O

______ ______

100.00 % 99.34 % = TOTAL OXIDE

Empirical Formula:

Na_4.2K_0.3Ba_0.1Ti_3.7Fe³⁺_0.2Nb_0.1Si_6.6Al_1.4O₂₆ï¿½(H₂O)

Environment:

Late-stage hydrothermal mineral in cavities and veins, and replacing Ti-bearing minerals, in alkalic pegmatites in differentiated alkalic massifs.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

In the Khibiny and Lovozero massifs, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Alexander Pavlovich Vinogradov, Russian geochemist.

Name Pronunciation:

Vinogradovite + Pronunciation

Vinogradovite Image

Images:

Vinogradovite

Comments: Off-white scaly vinogradovite on matrix.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vinogradovite Crystallography

Axial Ratios:

a:b:c =0.6249:1:2.8294

Cell Dimensions:

a = 5.35, b = 8.56, c = 24.22, Z = 2; beta = 101° V = 1,088.80 Den(Calc)= 2.98

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a

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

By Intensity(I/I_o): 3.28(1), 3.11(0.9), 6.2(0.8),

Physical Properties of Vinogradovite

Cleavage:

{010} Perfect

Color:

Colorless, White.

Density:

2.878

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

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

Habit:

Pseudo Orthorhombic - Crystals show an orthorhombic shape.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vinogradovite

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2555,KPDmeas= 0.2646,KC= 0.2637
Ncalc = 1.76 - 1.79

Optical Data:

Biaxial (-), a=1.691-1.745, b=1.769-1.773, g=1.773-1.818, bire=0.0730-0.0820, 2V(Calc)=24-80, 2V(Meas)=41-82.

Pleochroism (x):

colorless.

Pleochroism (y):

brownish.

Pleochroism (z):

brownish.

Calculated Properties of Vinogradovite

Electron Density:

Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Vinogradovite =2.88 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Vinogradovite}= 11.59 barns/electron
U=PE_{Vinogradovite} x r_electron= 32.57 barns/cc.

Radioactivity:

GRapi = 16.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Vinogradovite per GRapi unit = 5.91 (%)

Estimated Radioactivity from Vinogradovite - barely detectable

Vinogradovite Classification

Dana Class:

68.01.02.01 (68)Inosilicate Structures with Chains of More Than One Width

(68.01)Dana Type

(68.01.02)Dana Group

68.01.02.01 Vinogradovite (Na,K)4Ti4(Si,Al)8O26•3(H2O,Na) A2/a 2/m

68.01.02.02 Paravinogradovite! (Na,[])2(Ti,Fe)4(Si2O6)2(Si3AlO10)(OH)4•H2O P1 1

Strunz Class:

09.DB.25 09 - SILICATES (Germanates)

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

09.DB -Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals

09.DB.25 Vinogradovite (Na,K)4Ti4(Si,Al)8O26•3(H2O,Na) A2/a 2/m

09.DB.25 Paravinogradovite! (Na,[])2(Ti,Fe)4(Si2O6)2(Si3AlO10)(OH)4•H2O P1 1

Other Vinogradovite Information

References:

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

See Also:

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

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Vinogradovite

(Na,K)4Ti4(Si,Al)8O26•3(H2O,Na)
Dana No: 68.01.02.01 Strunz No: 09.DB.25
Locality:

Notes:

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