Zimbabweite
A valid IMA mineral species
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About Zimbabweite
Flag of Zimbabwe
Formula:
(Na,K)2PbAs4(Ta,Nb,Ti)4O18
Colour:
Yellow, yellow-brown
Lustre:
Adamantine
Hardness:
5 - 5½
Specific Gravity:
6.20
Crystal System:
Orthorhombic
Name:
Named after its discovery locality, St. Ann's Mine, Karoi District, south of Miami, Zimbabwe.
An arsenite-tantalate.
Unique Identifiers
Mindat ID:
4403
Long-form identifier:
mindat:1:1:4403:1
IMA Classification of Zimbabweite
Approved
IMA Formula:
Na(Pb2+,Na,K)2(Ta5+,Nb5+,Ti4+)4As3+4O18
Approval year:
1984
First published:
1986
Classification of Zimbabweite
4.JA.40
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
8.7.10.1
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
23.11
23 : Arsenites
23 : Arsenites
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Zbb | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Zimbabweite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Zimbabweite
Adamantine
Transparency:
Translucent
Colour:
Yellow, yellow-brown
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{010}
{010}
Density:
6.20(3) g/cm3 (Measured) 6.16 g/cm3 (Calculated)
Optical Data of Zimbabweite
Type:
Biaxial (+)
RI values:
nα = 2.10
2V:
Measured: 80° (4)
Max. Birefringence:
δ = 0.000
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r < v extreme
Pleochroism:
Visible
Comments:
X = pale yellow-brown, Y = light reddish-brown, Z = reddish-brown
Comments:
Z = a, Y = b, X = c
Chemistry of Zimbabweite
Mindat Formula:
(Na,K)2PbAs4(Ta,Nb,Ti)4O18
Element Weights:
Crystallography of Zimbabweite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 12.245(2) Å, b = 15.287(4) Å, c = 8.664(1) Å
Ratio:
a:b:c = 0.801 : 1 : 0.567
Unit Cell V:
1,621.81 ų (Calculated from Unit Cell)
Z:
4
Morphology:
{010}, {201}, and less prominent {100} and {111}.
Comment:
Space Group: Ccmb.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0001200 | Zimbabweite | Duesler E N, Chakoumakos B C, Foord E E (1988) Zimbabweite, Na(Pb,Na,K)2As4(Ta,Nb,Ti)4O18, an arsenite-tantalate with a novel corner-linked octahedral sheet American Mineralogist 73 1186-1190 |  | 1988 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.823 Å | (55) |
| 3.242 Å | (45) |
| 3.195 Å | (100) |
| 3.033 Å | (60) |
| 2.990 Å | (70) |
| 2.882 Å | (70) |
| 2.548 Å | (50) |
| 1.913 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) |
Type Occurrence of Zimbabweite
General Appearance of Type Material:
Honey yellow-brown euhedral to subhedral crystals, up to 1 x 1 x 2 cm.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 162513
Geological Setting of Type Material:
Hydrothermally kaolinitized zone of a granitic pegmatite.
Associated Minerals at Type Locality:
Synonyms of Zimbabweite
Other Language Names for Zimbabweite
Related Minerals - Strunz-mindat Grouping
| 4.JA.05 | Leiteite | Zn(As2O4) |
| 4.JA.10 | Reinerite | Zn3(AsO3)2 |
| 4.JA.15 | Karibibite | Fe3+3(As3+O2)4(As3+2O5)(OH) |
| 4.JA.20 | Manganoschafarzikite | MnSb2O4 |
| 4.JA.20 | Trippkeite | Cu2+As3+2O4 |
| 4.JA.20 | Schafarzikite | Fe2+Sb3+2O4 |
| 4.JA.20 | Kusachiite | CuBi2O4 |
| 4.JA.20 | Igelströmite | Fe3+(Sb3+Pb2+)O4 |
| 4.JA.25 | Apuanite | Fe2+Fe3+4Sb3+4O12S |
| 4.JA.30 | Versiliaite | Fe2Fe4Sb6O16S |
| 4.JA.35 | Schneiderhöhnite | Fe2+Fe3+3As3+5O13 |
| 4.JA.45 | Ludlockite | PbFe3+4As3+10O22 |
| 4.JA.50 | Paulmooreite | Pb2[As2O5] |
| 4.JA.55 | Stibivanite | Sb2VO5 |
| 4.JA.60 | Chadwickite | (UO2)[HAsO3] |
Fluorescence of Zimbabweite
Not fluorescent
Other Information
Magnetism:
Non-Magnetic
Notes:
Insoluble in common acids and bases
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Zimbabweite
mindat.org URL:
https://www.mindat.org/min-4403.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Zimbabweite
Localities for Zimbabweite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Zimbabwe (TL) | |
| Foord +3 other references |
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St Anns Mine, Mwami, Karoi District, Mashonaland West, Zimbabwe