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Kivuite (Kivuit)

Collectors Summary

Color gelb
Lustre Erdig
Hardness (Mohs) 2.5
Solubility +++ HNO3
Crystal System orthorhombisch,

Chemism

Chemical formula

(Th,Ca,Pb)(UO2)4(PO3OH)2(OH)8·7(H2O)

Chemical composition

Blei, Calcium, Thorium, Phosphor, Sauerstoff, Uran, Wasserstoff

Unit weight: 1706.2036184 u; Number of atoms in the formula: 62

Info

Empirical formula:

(Th0.6Ca0.3Pb0.1)(UO2)4(PO3OH)2(OH)8·7(H2O)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.42

24

38.71

1.0079470

24.1907280
Oxygen

O

29.07

31

50.00

15.9994300

495.9823300
Phosphorus

P

3.63

2

3.23

30.9737612

61.9475224
Calcium

Ca

0.70

0.3

0.48

40.0784000

12.0235200
Lead

Pb

1.21

0.1

0.16

207.2100000

20.7210000
Thorium

Th

8.16

0.6

0.97

232.0381100

139.2228660
Uranium

U

55.80

4

6.45

238.0289130

952.1156520

Strunz 9th edition incl. updates

8.EC.10

8: Phosphate, Arsenate, Vanadate
E: Uranylphosphate und Arsenate
C: UO2:RO4 = 3:2
10:Phosphuranylit-Gruppe

Lapis Classification

VII/E.07-120

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
E: Uranyl-Phosphate/Arsenate und Uranyl-Vanadate mit [UO2] 2+- [PO4]/[AsO4] 3- und [UO2] 2+-[V2O8] 6-, sowie isotype Vanadate (Sincosit-Reihe)

Classification by Hölzel

8.EB.580

8: PHOSPHATES ARSENATES VANADATES
E: Uranyl (Phospates-Arsenates-Vanadates)
B: Orthorhombic Uranyl (Phosphates-Arsenates)
5: C large, V=24 Arsenuranylite-Group

Hey's Chemical Index of Minerals

19.11.35

19: Phosphates
11: Phosphates of U

Dana 8th edition

42.04.09.03

42: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
04: Hydrated Phosphates, etc., Containing Hydroxyl or Halogen where (AB)5 (XO4)2 Zq · x(H2O)
09: Arsenuranylite Group

IMA status

diskreditiert CNMMN (1962)

Optical Properties

Color

gelb

Diaphaneity (Transparency)

durchscheinend

Lustre

Erdig

max. Birefringence

0.037
Birefringence chart\! Kivuite title=Birefringence chart Kivuite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.618

RI value β

1.654

RI value γ / ε

1.655

Ri mean

1.642

2V angle

Biaxial (-) 3°~

Absorption

Z = Y > X

Pleochroism

farblos zu grünlichgelb

Crystallography

Crystal System

orthorhombisch

Cell parameters a (Å)

15.88

Cell parameters b (Å)

17.24

Cell parameters c (Å)

13.76

Cell parameters a/b or c/a

0.921

Cell parameters c/b

0.798

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volumne (ų)

3767.092

X-Ray Powder Diffraction

10.3(100),
7.96(90),
5.88(60),
4.43(60),
3.94(60),
3.86(60),
3.08(80),
2.87(80)
XRD chart Kivuite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hardness (Mohs)

2.5

Density (g/cm³)

6.03 (berechnet)

6.016 ( ρ calc. Mineralienatlas )

Instability

+++ HNO3

Preface

Author (Name, Year)

van Wambeke, 1959

References

American Mineralogist 44 (1959), 1326.

Mineralogical Magazine 33 (1962), 261.

Powder Diffraction File (International Center for Diffraction Data) 13-419

Ramdohr-Strunz (1978): 656.

Other languages

German

Kivuit

English

Kivuite

Alternative Name

Spanish

Kivuita

Locations with GPS information