Vlasovite Mineral Data

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

IMA Status:

Approved IMA 1961

Locality:

Link to MinDat.org Location Data.

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, T?miscamingue Co., Qu?bec, 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

Diaphaniety:

Transparent

Fracture:

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

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent.

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

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:

r_electron=2.88 gm/cc
note: r_Vlasovite=2.97 gm/cc.

Fermion Index

Fermion Index = 0.03657
Boson Index = 0.96343

Photoelectric:

PE_Vlasovite= 29.66 barns/electron
U=PE_Vlasovite x r_electron= 85.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Vlasovite is Not Radioactive

Vlasovite Classification

Dana Class:

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

(66.2)with P=2 non-amphibole configuration

(66.2.2)Dana Group

66.2.2.1 Vlasovite Na2ZrSi4O11 C 2/c 2/m

Strunz Class:

VIII/F.34-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.34 - Grumantite - Penkvilksite series

VIII/F.34-10 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m

VIII/F.34-20 Vlasovite Na2ZrSi4O11 C 2/c 2/m

VIII/F.34-30 Penkvilksite Na4(Ti,Zr)2[Si8O22]·4(H2O) P 2₁/c 2/m

VIII/F.34-40 Tumchaite! Na2(Zr,Sn)Si4O11·2(H2O) P 2₁/c 2/m

Other Vlasovite Information

References:

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 - WWW-MINCRYST

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Vlasovite

Na2ZrSi4O11
Dana No: 66.2.2.1 Strunz No: VIII/F.34-20
Locality:

Notes: