Rabejacite Mineral Data

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General Rabejacite Information

Chemical Formula:

Ca(UO2)4(SO4)2(OH)6•6(H2O)

Composition:

Molecular Weight = 1,522.45 gm

Calcium 2.63 % Ca 3.68 % CaO

Uranium 62.54 % U 70.95 % UO₂

Hydrogen 1.19 % H 10.65 % H₂O

Sulfur 4.21 % S 10.52 % SO₃

Oxygen 29.43 % O

______ ______

100.00 % 95.80 % = TOTAL OXIDE

Empirical Formula:

Ca(UO₂)₄(SO₄)₂(OH)₆•6(H₂O)

Environment:

Associated with gypsum and other secondary uranium minerals as an alteration product of pitchblende.

IMA Status:

Approved IMA 1993

Locality:

Rabejac and Mas d'Alary village a few kilometers from Lodeve, France. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Rabejacite + Pronunciation

Synonym:

IMA1992-043

Rabejacite Image

Images:

Rabejacite

Comments: Yellow rabejacite grains on matrix.
Location: Mas d'Alary, Lodève, Hérault, Languedoc-Roussillon, France. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Rabejacite Crystallography

Axial Ratios:

a:b:c =0.5108:1:0.9198

Cell Dimensions:

a = 8.73, b = 17.09, c = 15.72, Z = 4; V = 2,345.36 Den(Calc)= 4.31

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 7.9(1), 3.49(0.8), 3.38(0.7),

Physical Properties of Rabejacite

Cleavage:

None

Color:

Yellow, Amber yellow.

Density:

4.1

Diaphaneity:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

3 - Calcite

Luminescence:

Fluorescent, Short UV=light yellow, Long UV=light yellow.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Rabejacite

Gladstone-Dale:

CI meas= -0.27 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.208 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1613,KPDmeas= 0.1695,KC= 0.1335
Ncalc = 1.55 - 1.58

Optical Data:

Biaxial (-), a=1.617, b=1.71, g=1.758, bire=0.1410, 2V(Calc)=68, 2V(Meas)=68. Dispersion r > v weak.

Pleochroism (x):

pale yellow.

Pleochroism (y):

pale yellow.

Pleochroism (z):

sulfur yellow.

Calculated Properties of Rabejacite

Electron Density:

Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Rabejacite =4.31 gm/cc.

Fermion Index:

Fermion Index = 0.004997256
Boson Index = 0.995002744

Photoelectric:

PE_Rabejacite=1,632.20 barns/electron
U=PE_Rabejacite x r_electron=6,117.79 barns/cc.

Radioactivity:

GRapi = 4,635,796.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Rabejacite per GRapi unit = 215.71 (PPB)

Rabejacite 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) 6.56 ± 1.64 grams of pure Rabejacite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 656.13 ±164.03 grams of pure Rabejacite .

**Estimated Radioactivity from Rabejacite** - 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 / 7.62 cm	111,943,578	3.03E-03	4,635,796.31	1,524.10
100 gm / 3.54 cm	11,194,358	3.03E-04	463,579.63	152.41
10 gm / 1.64 cm	1,119,436	3.03E-05	46,357.96	15.24
1 gm / 7.62 mm	111,944	3.03E-06	4,635.80	1.52
0.1 gm / 3.54 mm	11,194	3.03E-07	463.58	0.15
0.01 gm / 1.64 mm	1,119	3.03E-08	46.36	0.02
0.001 gm / 0.76 mm	112	3.03E-09	4.64	0.00

Weight of pure Rabejacite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.31 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

Rabejacite Classification

Dana Class:

31.06.08.01 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.06)where (A+ B++)5 (XO4)2 Zq·x(H2O)

(31.06.08)Dana Group

31.06.08.01 Rabejacite Ca(UO2)4(SO4)2(OH)6•6(H2O) Unk Ortho

Strunz Class:

07.EC.10 07 - SULFATES (SELENATES, TELLURATES)

07.E - Uranyl Sulfates

07.EC -With medium-sized and large cations

07.EC.10 Rabejacite Ca(UO2)4(SO4)2(OH)6•6(H2O) Unk Ortho

Other Rabejacite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Rabejacite :
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
15 - Uranium Minerals

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Rabejacite

Ca(UO2)4(SO4)2(OH)6•6(H2O)
Dana No: 31.06.08.01 Strunz No: 07.EC.10
Locality:

Notes: