Kuzmenkoite-Zn Mineral Data

General Kuzmenkoite-Zn Information

Chemical Formula:

K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O)

Composition:

Molecular Weight = 1,214.76 gm

Potassium 4.76 % K 5.74 % K₂O

Barium 1.81 % Ba 2.02 % BaO

Sodium 0.36 % Na 0.48 % Na₂O

Strontium 0.14 % Sr 0.17 % SrO

Calcium 1.58 % Ca 2.22 % CaO

Magnesium 0.02 % Mg 0.03 % MgO

Titanium 10.68 % Ti 17.82 % TiO₂

Manganese 1.63 % Mn 2.10 % MnO

Niobium 8.87 % Nb 12.69 % Nb₂O₅

Aluminum 0.04 % Al 0.08 % Al₂O₃

Zinc 3.01 % Zn 3.75 % ZnO

Iron 0.41 % Fe 0.53 % FeO

Silicon 18.22 % Si 38.98 % SiO₂

Hydrogen 1.56 % H 13.93 % H₂O

Oxygen 46.89 % O

______ ______

100.00 % 100.55 % = TOTAL OXIDE

Empirical Formula:

K_1.48Ca_0.48Na_0.19Ba_0.16Sr_0.02Zn_0.56Mn²⁺_0.36Fe²⁺_0.09Mg_0.01Ti_2.71Nb_1.162(Si_3.94)2(Al_0.01) 2(O_11.85)(OH)_2.19O_1.41ï¿½8.3(H₂O)

Environment:

Hydrothermal product in 3 pegmatites. May form pseudomorphs after murmanite. (labuntosovite group; structure)

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Mount Kedydverpakhk and Mount Krrnasurt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the Russian geochemist and mineralogist Maria V. Kuz'menko (1918-1995) and the Zn content.

Synonym:

IMA2001-037

Kuzmenkoite-Zn Crystallography

Axial Ratios:

a:b:c =1.0396:1:0.5617

Cell Dimensions:

a = 14.4, b = 13.851, c = 7.781, Z = 2; beta = 117.33° V = 1,378.72 Den(Calc)= 2.93

Crystal System:

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

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

By Intensity(I/I_o): 3.19(1)(400,421,402), 3.09(0.91)(041,022), 6.92(0.75)(020,001), 6.4(0.5)(201,200), 2.49(0.35)(441,403), 2.58(0.35)(241),

Physical Properties of Kuzmenkoite-Zn

Cleavage:

None

Color:

Colorless, White, Grayish white, Pale pink, Light brown.

Density:

2.78 - 2.87, Average = 2.82

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kuzmenkoite-Zn

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.245,KPDmeas= 0.2541,KC= 0.2635
Ncalc = 1.73 - 1.77

Optical Data:

Biaxial (+), a=1.68-1.683, b=1.686-1.688, g=1.783-1.787, bire=0.1030-0.1040, 2V(Calc)=28-30, 2V(Meas)=25. Dispersion dispersion not observed.

Calculated Properties of Kuzmenkoite-Zn

Electron Density:

Bulk Density (Electron Density)=2.79 gm/cc
note: Specific Gravity of Kuzmenkoite-Zn =2.83 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Kuzmenkoite-Zn}= 25.37 barns/electron
U=PE_{Kuzmenkoite-Zn} x r_electron= 70.70 barns/cc.

Radioactivity:

GRapi = 67.78 (Gamma Ray American Petroleum Institute Units)
Concentration of Kuzmenkoite-Zn per GRapi unit = 1.48 (%)

Estimated Radioactivity from Kuzmenkoite-Zn - barely detectable

Kuzmenkoite-Zn Classification

Dana Class:

60.01.03c.02 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03c)Labuntsovite Group (Kuzmenkoite subgroup Monoclinic [C2/m])

60.01.03c.01 Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m

60.01.03c.02 Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m

60.01.03c.03 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

60.01.03c.04 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

Strunz Class:

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

09.C - Cyclosilicates

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

09.CE.30c Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

09.CE.30c Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

09.CE.30c Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m

09.CE.30c Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m

09.CE.30c Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O) C 2/m 2/m

09.CE.30c Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

09.CE.30c Gjerdingenite-Ca! K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O C 2/m 2/m

09.CE.30c Gjerdingenite-Na! (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O C 2/m 2/m

09.CE.30c Burovaite-Ca! (K,Na)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8•12H2O C 2/m 2/m

Other Kuzmenkoite-Zn Information

References:

NAME( AmMin, v 88, p 932) PHYS. PROP.(AmMin, v 88, p 932) OPTIC PROP.(AmMin, v 88, p 932)

See Also:

Links to other databases for Kuzmenkoite-Zn :
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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Kuzmenkoite-Zn

K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O)
Dana No: 60.01.03c.02 Strunz No: 09.CE.30c
Locality:

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