Vinogradovite Mineral Data

Vinogradovite Mineral Data +

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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_1.4O₂₆·(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.

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 - PrismaticH-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),

Crystal Structure:

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Kalsbeek N , Ronsbo J G , Zeitschrift fur Kristallographie , 200 (1992) p.237-245, Refinement of the vinogradovite structure, positioning of Be and excess Na, Locality: Ilimaussaq, Southern Greenland, Note: T = 110 K

View Additional jPOWD Structure files for Vinogradovite
[1]

Physical Properties of Vinogradovite

Cleavage:

[010] Perfect

Color:

Colorless, White.

Density:

2.878

Diaphaniety:

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

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:

r_electron=2.81 gm/cc
note: r_{Vinogradovite}=2.88 gm/cc.

Fermion Index

Fermion Index = 0.03527
Boson Index = 0.96473

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)

Estimated Radioactivity from Vinogradovite - barely detectable

Vinogradovite Classification

Dana Class:

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

(68.1)Dana Type

(68.1.2)Dana Group

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

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

Strunz Class:

VIII/F.03-70 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.03 - Magnesiocarpholite - Vinogradovite series

VIII/F.03-10 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-20 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-30 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-40 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

VIII/F.03-50 Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m

VIII/F.03-60 Lintisite Na3LiTi2Si4O14·2(H2O) C 2/c 2/m

VIII/F.03-70 Vinogradovite (Na,K)4Ti4(Si,Al)8O26·3(H2O,Na) A2/a 2/m

VIII/F.03-80 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)

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Vinogradovite

(Na,K)4Ti4(Si,Al)8O26·3(H2O,Na)
Dana No: 68.1.2.1 Strunz No: VIII/F.03-70
Locality:

Notes: