Vuoriyarvite-K Mineral Data

General Vuoriyarvite-K Information

Chemical Formula:

(K,Na)2(Nb,Ti)2Si4O12(O,OH)2•4(H2O)

Composition:

Molecular Weight = 654.35 gm

Potassium 5.98 % K 7.20 % K₂O

Barium 2.10 % Ba 2.34 % BaO

Sodium 2.11 % Na 2.84 % Na₂O

Titanium 0.73 % Ti 1.22 % TiO₂

Niobium 25.56 % Nb 36.56 % Nb₂O₅

Silicon 17.17 % Si 36.73 % SiO₂

Hydrogen 1.37 % H 12.25 % H₂O

Oxygen 44.99 % O

______ ______

100.00 % 99.14 % = TOTAL OXIDE

Empirical Formula:

KNa_0.6Ba_0.1Nb_1.8Ti_0.1Si₄O_13.7(OH)_0.5•4.2(H₂O)

Environment:

The mineral formed by the hydrothermal alteration of pyrochlore.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Lake Vuoriyarvi and the Vuoriyarvi alkali-ultramafic complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

The name reflects the discovery locality.

Name Pronunciation:

Vuoriyarvite-K + Pronunciation

Synonym:

IMA1995-031

IMA2000-A

Vuoriyarvite

Vuoriyarvite-K Image

Images:

Vuoriyarvite-K

Comments: Light tan, compact mass of vuoryarvite-K micro-crystals associated with calcite and greenish sodalite.
Location: Vein No. 46, Kirovskii apatite mine (Kirovsky Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image.
© Rruff Database

Vuoriyarvite-K Crystallography

Axial Ratios:

a:b:c =1.0372:1:0.5548

Cell Dimensions:

a = 14.692, b = 14.164, c = 7.859, Z = 4; beta = 117.87° V = 1,445.74 Den(Calc)= 3.01

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cm

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

By Intensity(I/I_o): 3.262(1)(421), 7.1(0.9)(020), 3.151(0.8)(041),4.98(0.6)(021), 2.956(0.6)(112), 1.723(0.4)(463,463,714,2.549(0.4)(441),

Physical Properties of Vuoriyarvite-K

Cleavage:

None

Color:

White.

Density:

2.95

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Vuoriyarvite-K

Gladstone-Dale:

CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2285,KPDmeas= 0.2331,KC= 0.2433
Ncalc = 1.72 - 1.73

Optical Data:

Biaxial (+), a=1.649, b=1.655, g=1.759, bire=0.1100, 2V(Calc)=30, 2V(Meas)=20-28. Dispersion weak, r < v.

Calculated Properties of Vuoriyarvite-K

Electron Density:

Bulk Density (Electron Density)=2.88 gm/cc
note: Specific Gravity of Vuoriyarvite-K =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Vuoriyarvite-K}= 47.12 barns/electron
U=PE_{Vuoriyarvite-K} x r_electron= 135.66 barns/cc.

Radioactivity:

GRapi = 84.12 (Gamma Ray American Petroleum Institute Units)
Concentration of Vuoriyarvite-K per GRapi unit = 1.19 (%)

Estimated Radioactivity from Vuoriyarvite-K - barely detectable

Vuoriyarvite-K Classification

Dana Class:

60.01.03b.01 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03b)Labuntsovite Group (Vuoriyarvite subgroup Monoclinic [Cm])

60.01.03b.01 Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2•4(H2O) Cm m

60.01.03b.02 Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(H2O) Cm m

60.01.03b.03 Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

60.01.03b.04 Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/m

60.01.03b.05 Paratsepinite-Ba! (Ba,Na,K)2-x(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/m

60.01.03b.06 Tsepinite-Sr! (Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

Strunz Class:

09.CE.30b 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.30b Vuoriyarvite-K! (K,Na)2(Nb,Ti)2Si4O12(O,OH)2•4(H2O) Cm m

09.CE.30b Tsepinite-Sr! (Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

09.CE.30b Tsepinite-Ca! (Ca,K,Na,[])2(Ti,Nb)2(Si4O12)(OH,O)2•4(H2O) C 2/m 2/m

09.CE.30b Tsepinite-K! (K,Ba,Na)2(Ti,Nb)2(Si4O12)(OH,O)2•3(H2O) Cm m

09.CE.30b Tsepinite-Na! (Na,H3O,K,Sr,Ba)2(Ti,Nb)2[Si4O12](OH,O)2•3(H2O) Cm m

Other Vuoriyarvite-K Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(AmMin, Vol 83, p 1349) OPTIC PROP.(AmMin, Vol 83, p 1349)

See Also:

Links to other databases for Vuoriyarvite-K :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Vuoriyarvite-K

(K,Na)2(Nb,Ti)2Si4O12(O,OH)2•4(H2O)
Dana No: 60.01.03b.01 Strunz No: 09.CE.30b
Locality:

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