Paravinogradovite Mineral Data

Paravinogradovite Mineral Data

General Paravinogradovite Information

Chemical Formula:

(Na,[ ])2(Ti,Fe+++)4(Si2O6)2(Si3AlO10)(OH)4·H2O

Composition:

Molecular Weight = 902.89 gm

Potassium 0.74 % K 0.89 % K₂O

Sodium 5.81 % Na 7.83 % Na₂O

Magnesium 0.08 % Mg 0.13 % MgO

Titanium 17.87 % Ti 29.81 % TiO₂

Beryllium 0.28 % Be 0.78 % BeO

Aluminum 3.26 % Al 6.15 % Al₂O₃

Iron 2.91 % Fe 4.16 % Fe₂O₃

Silicon 20.50 % Si 43.85 % SiO₂

Hydrogen 0.70 % H 6.27 % H₂O

Oxygen 47.86 % O

______ ______

100.00 % 99.87 % = TOTAL OXIDE

Empirical Formula:

Na_2.28K_0.17Ti_3.37Fe³⁺_0.47Mg_0.03Si_6.59Al_1.09Be_0.28O₂₂(OH)_3.74·1.27(H₂O)

Environment:

Strongly mineralized nepheline-feldspar pegmatite. Related to vinogradovite; structure determined.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Mount Kukisvumchorr, Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the relationship to vinogradovite.

Synonym:

IMA2002-033

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Paravinogradovite Crystallography

Axial Ratios:

a:b:c =0.6009:1:1.4812

Cell Dimensions:

a = 5.2533, b = 8.7411, c = 12.948, Z = 1; alpha = 70.47°, beta = 78.47°, gamma = 89.93° V = 549.05 Den(Calc)= 2.73

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: P1

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

By Intensity(I/I_o): 3.182(1)(013,014), 5.88(0.65)(011,012), 11.9(0.58)(001),4.35(0.38)(021,102), 5.98(0.35)(002), 3.085(0.29)(123), 2.735(0.21)(122),

Crystal Structure:

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Khomyakov A P , Kulikova I E , Sokolova E V , Hawthorne F C , Kartashov P M , The Canadian Mineralogist , 41 (2003) p.989-1002

Physical Properties of Paravinogradovite

Cleavage:

[001] Perfect, [010] Indistinct

Color:

White.

Density:

2.77

Diaphaniety:

Translucent to transparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

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

Hardness:

5 - Apatite

Luminescence:

Fluorescent, Short UV=week yellow green, Long UV=week yellow green.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Paravinogradovite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.269,KPDmeas= 0.2651,KC= 0.2743

Optical Data:

Biaxial (-), a=1.707, b=1.741, g=1.755, bire=0.0480, 2V(Calc)=64, 2V(Meas)=64. Dispersion r > v.

Calculated Properties of Paravinogradovite

Electron Density:

r_electron=2.69 gm/cc
note: r_{Paravinogradovite}=2.73 gm/cc.

Fermion Index

Fermion Index = 0.0364
Boson Index = 0.9636

Photoelectric:

PE_{Paravinogradovite}= 4.83 barns/electron
U=PE_{Paravinogradovite} x r_electron= 13.00 barns/cc.

Radioactivity:

GRapi = 10.47 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Paravinogradovite - barely detectable

Paravinogradovite Classification

Dana Class:

68.1.2.2 (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.03-80 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 Paravinogradovite Information

References:

NAME( CanMin, v 41, p 989) PHYS. PROP.(CanMin, v 41, p 989) OPTIC PROP.(CanMin, v 41, p 989)

See Also:

Links to other databases for Paravinogradovite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Paravinogradovite

(Na,[ ])2(Ti,Fe+++)4(Si2O6)2(Si3AlO10)(OH)4·H2O
Dana No: 68.1.2.2 Strunz No: VIII/F.03-80
Locality:

Notes: