Kivuite Mineral Data

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General Kivuite Information

Chemical Formula:

(Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8•7(H2O)

Composition:

Molecular Weight = 1,706.20 gm

Calcium 0.70 % Ca 0.99 % CaO

Thorium 8.16 % Th 9.29 % ThO₂

Uranium 55.80 % U 63.31 % UO₂

Phosphorus 3.63 % P 8.32 % P₂O₅

Hydrogen 1.42 % H 12.67 % H₂O

Lead 1.21 % Pb 1.31 % PbO

Oxygen 29.07 % O

______ ______

100.00 % 95.87 % = TOTAL OXIDE

Empirical Formula:

Th_0.6Ca_0.3Pb_0.1H₂(UO₂)₄(PO₄)₂(OH)₈·7(H₂O)

IMA Status:

Discredited IMA 1962 - Valid Mineral (Pre-IMA) 1958

Locality:

Kobokobo pegmatite, Kivu, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named in 1958 for the locality.

Kivuite Image

Images:

Kivuite Dewindtite

Comments: Pale yellow coatings of kivuite with yellowier dewindtite on pegmatite.
Location: Ruggles Mine, Grafton, Grafton County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kivuite Crystallography

Axial Ratios:

a:b:c =0.9211:1:0.7981

Cell Dimensions:

a = 15.88, b = 17.24, c = 13.76, Z = 6; V = 3,767.09 Den(Calc)= 4.51

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 10.3(1), 7.96(0.9), 2.87(0.8),3.08(0.8), 3.86(0.6), 3.94(0.6), 4.43(0.6), 5.88(0.6),

Physical Properties of Kivuite

Color:

Yellow.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-fluorescent.

Streak:

light yellow

Optical Properties of Kivuite

Gladstone-Dale:

CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1424,KC= 0.1409
Ncalc = 1.64

Optical Data:

Biaxial (-), a=1.618, b=1.654, g=1.655, bire=0.0370, 2V(Calc)=18, 2V(Meas)=0-5.

Pleochroism (x):

colorless.

Pleochroism (y):

greenish yellow.

Pleochroism (z):

greenish yellow.

Calculated Properties of Kivuite

Electron Density:

Bulk Density (Electron Density)=3.90 gm/cc
note: Specific Gravity of Kivuite =4.51 gm/cc.

Fermion Index:

Fermion Index = 0.0068528974
Boson Index = 0.9931471026

Photoelectric:

PE_Kivuite=1,683.33 barns/electron
U=PE_Kivuite x r_electron=6,569.32 barns/cc.

Radioactivity:

GRapi = 4,266,550.16 (Gamma Ray American Petroleum Institute Units)
Concentration of Kivuite per GRapi unit = 234.38 (PPB)

Kivuite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 7.13 ± 1.78 grams of pure Kivuite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 712.91 ±178.23 grams of pure Kivuite .

**Estimated Radioactivity from Kivuite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.51 cm	103,543,393	2.80E-03	4,266,550.16	1,402.70
100 gm / 3.49 cm	10,354,339	2.80E-04	426,655.02	140.27
10 gm / 1.62 cm	1,035,434	2.80E-05	42,665.50	14.03
1 gm / 7.51 mm	103,543	2.80E-06	4,266.55	1.40
0.1 gm / 3.49 mm	10,354	2.80E-07	426.66	0.14
0.01 gm / 1.62 mm	1,035	2.80E-08	42.67	0.01
0.001 gm / 0.75 mm	104	2.80E-09	4.27	0.00

Weight of pure Kivuite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.51 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem

Kivuite Classification

Dana Class:

42.04.09.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.04)where (AB)5 (XO4)2 Zq · x(H2O)

(42.04.09)Arsenuranylite Group

42.04.09.01 Arsenuranylite Ca(UO2)4(AsO4)2(OH)4•6(H2O) Bmmb 2/m 2/m 2/m

42.04.09.02 Renardite Pb(UO2)4(PO4)2(OH)4•7(H2O) Bmmb 2/m 2/m 2/m

42.04.09.03 Kivuite? (Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8•7(H2O) Unk Ortho

Strunz Class:

08.EC.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EC -UO2:RO4 = 3:2

08.EC.10 Arsenuranylite Ca(UO2)4(AsO4)2(OH)4•6(H2O) Bmmb 2/m 2/m 2/m

08.EC.10 Dewindtite Pb3[H(UO2)3O2(PO4)2]2•12(H2O) Bmmb 2/m 2/m 2/m

08.EC.10 Kivuite? (Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8•7(H2O) Unk Ortho

08.EC.10 Renardite Pb(UO2)4(PO4)2(OH)4•7(H2O) Bmmb 2/m 2/m 2/m

08.EC.10 Phosphuranylite KCa(H3O)3(UO2)7(PO4)4O4•8(H2O) C mcm 2/m 2/m 2/m

08.EC.10 Yingjiangite (K2,Ca)(UO2)7(PO4)4(OH)6•6(H2O) Bmmb 2/m 2/m 2/m

Other Kivuite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Kivuite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - Uranium Minerals

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Kivuite

(Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8•7(H2O)
Dana No: 42.04.09.03 Strunz No: 08.EC.10
Locality:

Notes: