Parakuzmenkoite-Fe Mineral Data

General Parakuzmenkoite-Fe Information

Chemical Formula:

(K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)

Composition:

Molecular Weight = 2,567.15 gm

Potassium 2.44 % K 2.94 % K₂O

Barium 8.02 % Ba 8.96 % BaO

Sodium 0.36 % Na 0.48 % Na₂O

Strontium 0.34 % Sr 0.40 % SrO

Calcium 0.16 % Ca 0.22 % CaO

Titanium 8.21 % Ti 13.69 % TiO₂

Manganese 1.50 % Mn 1.93 % MnO

Niobium 12.30 % Nb 17.60 % Nb₂O₅

Zinc 0.25 % Zn 0.32 % ZnO

Iron 3.92 % Fe 5.60 % Fe₂O₃

Silicon 17.50 % Si 37.45 % SiO₂

Hydrogen 1.19 % H 10.60 % H₂O

Oxygen 43.81 % O

______ ______

100.00 % 100.19 % = TOTAL OXIDE

Empirical Formula:

K_1.6Na_0.4Ba_1.5Sr_0.1Ca_0.1Zn_0.1Fe³⁺_1.6Mn²⁺_0.7Ti_4.4Nb_3.4Fe³⁺_0.2(Si₄O₁₂)₄ O_6.4(OH)_1.6ï¿½14.3(H₂O)

Environment:

Alkaline pegmatite. Labuntsovite group; structure.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

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

Name Origin:

Named as the Fe-dominant analog of kuzmenkoite-Mn with a doubled c-axis.

Synonym:

IMA2001-007

Parakuzmenkoite-Fe Crystallography

Axial Ratios:

a:b:c =1.0381:1:1.1229

Cell Dimensions:

a = 14.41, b = 13.88, c = 15.587, Z = 2; beta = 117.53° V = 2,764.56 Den(Calc)= 3.08

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.09(1)(042,024), 3.19(1)(422,400), 6.91(1)(020,002),2.58(0.9)(480,484,4.2.11.422(0.8),

Physical Properties of Parakuzmenkoite-Fe

Cleavage:

{???} Imperfect

Color:

Orange, Reddish orange.

Density:

Diaphaneity:

Translucent

Habit:

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

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Parakuzmenkoite-Fe

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.236,KPDmeas= 0.2423,KC= 0.256
Ncalc = 1.77 - 1.79

Optical Data:

Biaxial (+), a=1.687, b=1.689, g=1.805, bire=0.1180

Calculated Properties of Parakuzmenkoite-Fe

Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Parakuzmenkoite-Fe =3.00 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Parakuzmenkoite-Fe}= 55.51 barns/electron
U=PE_{Parakuzmenkoite-Fe} x r_electron= 161.49 barns/cc.

Radioactivity:

GRapi = 34.08 (Gamma Ray American Petroleum Institute Units)
Concentration of Parakuzmenkoite-Fe per GRapi unit = 2.93 (%)

Estimated Radioactivity from Parakuzmenkoite-Fe - barely detectable

Parakuzmenkoite-Fe Classification

Dana Class:

60.01.03h.03 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03h)Labuntsovite Group (Organovaite subgroup Monoclinic [C2/m])

60.01.03h.01 Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) Cm m

60.01.03h.02 Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

60.01.03h.03 Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

Strunz Class:

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

09.C - Cyclosilicates

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

09.CE.30g Parakuzmenkoite-Fe! (K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

09.CE.30g Organovaite-Zn! K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

09.CE.30g Organovaite-Mn! K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) Cm m

Other Parakuzmenkoite-Fe Information

References:

NAME( AmMin, v 87, p 1735) PHYS. PROP.(AmMin, v 87, p 1735) OPTIC PROP.(AmMin, v 87, p 1735)

See Also:

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

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Parakuzmenkoite-Fe

(K,Ba)2Fe(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)
Dana No: 60.01.03h.03 Strunz No: 09.CE.30g
Locality:

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