Kivuite
A discredited species name
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Formula:
Th(UO2)4(PO3OH)2(OH)8 · 7H2O
Name:
named for the Kivu region
Originally reported from Kobokobo pegmatite, Lusungu River District, South Kivu, Democratic Republic of Congo (Zaïre)in L. Van Wambeke: "Contribution a l'etude de la mineralisation radioactive de la pegmatite de Kobokobo et description d'une nouvelle espece minerale radioactive de la serie phosphuranylite-renardite: la kivuite." Bull. soc. belge geol., paleontol., et hydrol, 67, 383-403 (1958) (publ. 1959).
Michael Fleischer commented in the American Mineralogist, v. 44 (1959, September-October), p. 1326-1327: "Discussion. The analysis is unsatisfactory, because one cannot tell how the impurities were deducted. Needs confirmation and tests for homogeneity, in view of the behavior with nitric acid."
L. Van Wambeke (1971) later informally discredited kivuite in "The Problem of Cation Deficiencies in Some Phosphates Due to Alteration Processes", American Mineralogist, vol. 56, p. 1380: "Eylettersite is not only the first radioactive mineral in the crandallite series, but also the first hydrated Th phosphate found in nature, the mineral kivuite being often a mixture of thorian crandallite or eylettersite with phosphuranylite."
Michael Fleischer commented in the American Mineralogist, v. 44 (1959, September-October), p. 1326-1327: "Discussion. The analysis is unsatisfactory, because one cannot tell how the impurities were deducted. Needs confirmation and tests for homogeneity, in view of the behavior with nitric acid."
L. Van Wambeke (1971) later informally discredited kivuite in "The Problem of Cation Deficiencies in Some Phosphates Due to Alteration Processes", American Mineralogist, vol. 56, p. 1380: "Eylettersite is not only the first radioactive mineral in the crandallite series, but also the first hydrated Th phosphate found in nature, the mineral kivuite being often a mixture of thorian crandallite or eylettersite with phosphuranylite."
Unique Identifiers
Mindat ID:
2221
Long-form identifier:
mindat:1:1:2221:3
Similar Names
| Cavoite | A valid IMA mineral species | CaV34+O7 |
| Covite | A rock subtype | |
| Gavite | A variety of Talc | Mg4Si5O12(OH)4 ? |
| Keiviite-(Y) | A valid IMA mineral species | Y2Si2O7 |
| Keiviite-(Y)-Keiviite-(Yb) Series | A solid-solution series between two end-member minerals | |
| Keiviite-(Yb) | A valid IMA mineral species | Yb2Si2O7 |
| Kievite | A synonym of Cummingtonite | |
| Kivite | A rock subtype |
IMA Classification of Kivuite
Discredited
Classification of Kivuite
8.EC.10
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
C : UO2:RO4 = 3:2
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
C : UO2:RO4 = 3:2
42.4.9.3
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq·xH2O
19.11.35
19 : Phosphates
11 : Phosphates of U
19 : Phosphates
11 : Phosphates of U
Optical Data of Kivuite
Type:
Biaxial (-)
RI values:
nα = 1.618 nβ = 1.654 nγ = 1.655
2V:
Calculated: 18°
Max. Birefringence:
δ = 0.037
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:
noticable
Chemistry of Kivuite
Mindat Formula:
Th(UO2)4(PO3OH)2(OH)8 · 7H2O
Element Weights:
Common Impurities:
Ca,Pb
Other Language Names for Kivuite
Related Minerals - Strunz-mindat Grouping
| 8.EC.05 | Upalite | Al(UO2)3(PO4)2O(OH) · 7H2O |
| 8.EC.05 | Françoisite-(Nd) | (Nd,Ce,Sm)(UO2)3(PO4)2O(OH) · 6H2O |
| 8.EC.05 | Françoisite-(Ce) | (Ce,Nd,Ca)(UO2)3(PO4)2O(OH) · 6H2O |
| 8.EC.05 | Phuralumite | Al2[(UO2)3(PO4)2O(OH)](OH)3(H2O)9 |
| 8.EC.10 | Yingjiangite | K2Ca(UO2)7(PO4)4(OH)6 · 6H2O |
| 8.EC.10 | Renardite | Pb(UO2)4(PO4)2(OH)4 · H2O |
| 8.EC.10 | Phosphuranylite | KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O |
| 8.EC.10 | Arsenuranylite | Ca(UO2)4(AsO4)2(OH)4 · 6H2O |
| 8.EC.10 | Dewindtite | H2Pb3(UO2)6O4(PO4)4 · 12H2O |
| 8.EC.15 | Dumontite | Pb2(UO2)3O2(PO4)2 · 5H2O |
| 8.EC.15 | Hügelite | Pb2(UO2)3(AsO4)2O2 · 5H2O |
| 8.EC.20 | Vanmeersscheite | U6+(UO2)3(PO4)2(OH)6 · 4H2O |
| 8.EC.20 | Arsenovanmeersscheite | U6+(UO2)3(AsO4)2(OH)6 · 4H2O |
| 8.EC.20 | Metavanmeersscheite | U6+(UO2)3(PO4)2(OH)6 · 2H2O |
| 8.EC.25 | Althupite | AlTh(UO2)7(PO4)4(OH)5O2 · 15H2O |
| 8.EC.30 | Mundite | Al(UO2)3(PO4)2(OH)3 · 5.5H2O |
| 8.EC.35 | Phurcalite | Ca2(UO2)3(PO4)2O2 · 7H2O |
| 8.EC.40 | Bergenite | Ca2Ba4(UO2)9(PO4)6O6 · 16H2O |
Radioactivity
Other Information
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 Kivuite
mindat.org URL:
https://www.mindat.org/min-2221.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Kivuite
Localities for Kivuite
Showing 4 localities.
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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.
China | |
| Anthony |
| Anthony |
DR Congo | |
| - (1962) |
USA | |
|
