Vlasovite Mineral Data

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General Vlasovite Information

Chemical Formula:

Na2ZrSi4O11

Composition:

Molecular Weight = 425.54 gm

Sodium 10.81 % Na 14.56 % Na₂O

Zirconium 21.44 % Zr 28.96 % ZrO₂

Silicon 26.40 % Si 56.48 % SiO₂

Oxygen 41.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂ZrSi₄O₁₁

Environment:

A late phase in nepheline syenites, syenitic pegmatites, and along the contact zone of a differentiated alkalic massif.

IMA Status:

Approved IMA 1961

Locality:

Mt. Vavnbed, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Kuz'ma Alekseevich Vlasov (1905-1964), founder of the Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Elements, Moscow, Russia.

Name Pronunciation:

Vlasovite + Pronunciation

Synonym:

ICSD 6267

PDF 39-208

Vlasovite Image

Images:

Vlasovite Eudialyte

Comments: Transparent yellow-gray vlasovite crystal frozen in pink eudialyte matrix.
Location: Kipawa alkaline complex, near Sheffield Lake, Villedieu Township, Témiscamingue Co., Québec, Canada. Scale: 2x2x1 cm.
© John Betts - Fine Minerals

Vlasovite Crystallography

Axial Ratios:

a:b:c =1.0979:1:0.852

Cell Dimensions:

a = 10.98, b = 10, c = 8.52, Z = 4; beta = 100.4° V = 920.13 Den(Calc)= 3.07

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.26(1), 2.966(0.94), 5.02(0.72),

Crystal Structure:

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Voronkov A A , Zhdanova T A , Pyatenko Y A , Kristallografiya , 19 (1974) p.252-259, Refinement of the structure of vlasovite Na2ZrSi4O11 and some characteristics of, the composition and structure of the zirconosilicates

View Additional jPOWD Structure files for Vlasovite
[1]

Physical Properties of Vlasovite

Cleavage:

{010} Distinct

Color:

Colorless.

Density:

2.97

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent, Short UV=strong orange-yellow, Long UV=strong orange-yellow.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Vlasovite

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2017,KPDmeas= 0.2085,KC= 0.2062
Ncalc = 1.61 - 1.63

Optical Data:

Biaxial (-), a=1.607, b=1.623, g=1.628, bire=0.0210

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Vlasovite

Electron Density:

Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Vlasovite =2.97 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Vlasovite= 29.66 barns/electron
U=PE_Vlasovite x rElectron Density= 85.30 barns/cc.

Radioactivity:

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

Vlasovite Classification

Dana Class:

66.02.02.01 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.02)with P=2 non-amphibole configuration

(66.02.02)Dana Group

66.02.02.01 Vlasovite Na2ZrSi4O11 C 2/c 2/m

Strunz Class:

09.DM.25 09 - SILICATES (Germanates)

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

09.DM -Inosilicates with 6-periodic single chains

09.DM.25 Vlasovite Na2ZrSi4O11 C 2/c 2/m

Other Vlasovite Information

References:

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

See Also:

Links to other databases for Vlasovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - Handbook of Mineralogy (MinSocAm)
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Vlasovite

Na2ZrSi4O11
Dana No: 66.02.02.01 Strunz No: 09.DM.25
Locality:

Notes: