Mineralogy Database

Zimbabweite Mineral Data

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General Zimbabweite Information

Help on Chemical  Formula: Chemical Formula: Na(Pb,Na,K)2(Ta,Nb,Ti)4As+++4O18
Help on Composition: Composition: Molecular Weight = 1,498.05 gm
   Potassium   1.30 %  K     1.57 % K2O
   Sodium      2.30 %  Na    3.10 % Na2O
   Tantalum   38.65 %  Ta   47.20 % Ta2O5
   Titanium    0.96 %  Ti    1.60 % TiO2
   Niobium     3.72 %  Nb    5.32 % Nb2O5
   Arsenic    20.01 %  As   26.41 % As2O3
   Lead       13.83 %  Pb   14.37 % Pb2O
   Oxygen     19.22 %  O
             ______        ______ 
             100.00 %       99.57 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.5K0.5PbAs4Ta3.2Nb0.6Ti0.3O18
Help on Environment: Environment: In a kaolinized pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: St. Ann's mine, Karoi district, SE of Miami, Zimbabwe. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the country of origin.
Help on Name Pronunciation: Name Pronunciation: Zimbabweite + Pronunciation Say ZIMBABWEITE
Help on Synonym: Synonym: ICSD 202709
  PDF 39-356

Zimbabweite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.801:1:0.568
Help on Cell Dimensions: Cell Dimensions: a = 12.245, b = 15.287, c = 8.684, Z = 4; V = 1,625.55 Den(Calc)= 6.12
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Ccmb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.195(1), 2.882(0.7), 2.99(0.7),

Physical Properties of Zimbabweite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Yellow brown, Honey yellow.
Help on Density: Density: 6.2
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Zimbabweite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.104 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1797,KPDmeas= 0.1774,KC= 0.1629
Ncalc = 2 - 2.01
Help on Optical Data: Optical Data: Biaxial (+), a=2.1, 2V(Meas)=80. Dispersion r < v very strong.
Help on Pleochroism (x): Pleochroism (x): pale yellow brown.
Help on Pleochroism (y): Pleochroism (y): light reddish brown.
Help on Pleochroism (z): Pleochroism (z): reddish brown.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Zimbabweite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   17.60   17.80 
 546 nm   17.00   17.10 
 589 nm   16.60   16.70 
 650 nm   16.20   16.50 
Calculated Relative Intensity Colors of Zimbabweite in Air
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 530%

Calculated Properties of Zimbabweite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.37 gm/cc
note: Specific Gravity of Zimbabweite =6.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEZimbabweite = 726.01 barns/electron
U=PEZimbabweite x relectron=3,898.95 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 16.29 (Gamma Ray American Petroleum Institute Units)
Concentration of Zimbabweite per GRapi unit = 6.14 (%)

Estimated Radioactivity from Zimbabweite - barely detectable


Zimbabweite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.07)Dana Type
  (08.07.10)Dana Group Zimbabweite Na(Pb,Na,K)2(Ta,Nb,Ti)4As4O18 Ccmb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.JA.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JA -Arsenites, antimonites, bismuthites; without additional anions, without H2O
04.JA.40 Zimbabweite Na(Pb,Na,K)2(Ta,Nb,Ti)4As4O18 Ccmb 2/m 2/m 2/m

Other Zimbabweite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3, Dana8)
Help on See Also: See Also: Links to other databases for Zimbabweite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.JA.40





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