Alsakharovite-Zn Mineral Data

General Alsakharovite-Zn Information

Chemical Formula:

NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)

Composition:

Molecular Weight = 1,240.78 gm

Potassium 1.99 % K 2.39 % K₂O

Barium 3.21 % Ba 3.58 % BaO

Sodium 1.50 % Na 2.02 % Na₂O

Strontium 3.74 % Sr 4.43 % SrO

Calcium 1.03 % Ca 1.45 % CaO

Titanium 11.19 % Ti 18.67 % TiO₂

Niobium 8.69 % Nb 12.43 % Nb₂O₅

Zinc 4.01 % Zn 4.99 % ZnO

Iron 0.18 % Fe 0.23 % FeO

Silicon 18.11 % Si 38.74 % SiO₂

Hydrogen 1.23 % H 10.96 % H₂O

Oxygen 45.13 % O

______ ______

100.00 % 99.88 % = TOTAL OXIDE

Empirical Formula:

Na_0.68Ca_0.32Sr_0.53Na_0.13K_0.63Ba_0.29Zn_0.76Fe²⁺_0.04Ti_2.9Nb_1.16Si₈O₂₄O_2.9(OH)_1.1·7(H₂O)

Environment:

Hydrothemal mineral in cavities of a eudialyte-aegirine-feldspar pegmatite. Labuntsovite group, gutkovaite subgroup; structure determined.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Lepkhe-Nelm Mountain, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Aleksey S. Sakharov (1910-1996), Russian geologist who studied the Lovozero alkaline massif.

Synonym:

IMA2002-003

Alsakharovite-Zn Image

Images:

Alsakharovite-Zn

Comments: Light brown crystal fragment of alsakharovite-Zn.
Location: Lepkhe Nelm Mountain, Lovozero, Kola Peninsula, Russia. Scale: Crystal size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Alsakharovite-Zn Crystallography

Axial Ratios:

a:b:c =1.0394:1:0.562

Cell Dimensions:

a = 14.495, b = 13.945, c = 7.838, Z = 2; beta = 117.75° V = 1,402.10 Den(Calc)= 2.94

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

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

By Intensity(I/I_o): 6.96(1)(020,001), 3.11(0.9)(041,022,240), 3.21(0.8)(402,421,400), 1.7(0.4)(463,444,461,442.5(0.4)(441,403), 2.6(0.35)(15

Physical Properties of Alsakharovite-Zn

Cleavage:

None

Color:

White, Pale brown, Colorless.

Density:

2.9

Diaphaneity:

Translucent to transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Alsakharovite-Zn

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2442,KPDmeas= 0.2476,KC= 0.2554
Ncalc = 1.74 - 1.75

Optical Data:

Biaxial (+), a=1.68, b=1.687, g=1.787, bire=0.1070, 2V(Calc)=32, 2V(Meas)=25. Dispersion dispersion not observed.

Calculated Properties of Alsakharovite-Zn

Electron Density:

Bulk Density (Electron Density)=2.83 gm/cc
note: Specific Gravity of Alsakharovite-Zn =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Alsakharovite-Zn}= 34.73 barns/electron
U=PE_{Alsakharovite-Zn} x r_electron= 98.39 barns/cc.

Radioactivity:

GRapi = 28.00 (Gamma Ray American Petroleum Institute Units)
Concentration of Alsakharovite-Zn per GRapi unit = 3.57 (%)

Estimated Radioactivity from Alsakharovite-Zn - barely detectable

Alsakharovite-Zn Classification

Dana Class:

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

(60.01)as Titanosilicates

(60.01.03f)Labuntsovite Group (Gutkovaite subgroup Monoclinic [Cm])

60.01.03f.01 Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4•5(H2O) Cm m

60.01.03f.02 Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

60.01.03f.03 Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4•6(H2O) Cm m

Strunz Class:

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

09.C - Cyclosilicates

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

09.CE.30h Gutkovaite-Mn! CaK2Mn(Ti,Nb)4(Si4O12)2(O,OH)4•5(H2O) Cm m

09.CE.30h Alsakharovite-Zn! NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

09.CE.30h Neskevaaraite-Fe! NaK3Fe(Ti,Nb)4(Si4O12)2(O,OH)4•6(H2O) Cm m

Other Alsakharovite-Zn Information

References:

NAME( CanMin, 41:1309) PHYS. PROP.(CanMin, 41:1309) OPTIC PROP.(CanMin, 41:1309)

See Also:

Links to other databases for Alsakharovite-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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Print or Cut-and-Paste your Alsakharovite-Zn Specimen Label here :

Alsakharovite-Zn

NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)
Dana No: 60.01.03f.02 Strunz No: 09.CE.30h
Locality:

Notes: