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Rabejacite Mineral Data

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General Rabejacite Information

Help on Chemical  Formula: Chemical Formula: Ca(UO2)4(SO4)2(OH)6•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca(UO2)4(SO4)2(OH)6•6(H2O)
Help on Environment: Environment: Associated with gypsum and other secondary uranium minerals as an alteration product of pitchblende.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: Rabejac and Mas d'Alary village a few kilometers from Lodeve, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Rabejacite + Pronunciation Say RABEJACITE
Help on Synonym: Synonym: IMA1992-043

Rabejacite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.5108:1:0.9198
Help on Cell Dimensions: Cell Dimensions: a = 8.73, b = 17.09, c = 15.72, Z = 4; V = 2,345.36 Den(Calc)= 4.31
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.9(1), 3.49(0.8), 3.38(0.7),

Physical Properties of Rabejacite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow, Amber yellow.
Help on Density: Density: 4.1
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Hardness: Hardness: 3 - Calcite
Help on Luminescence: Luminescence: Fluorescent, Short UV=light yellow, Long UV=light yellow.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Rabejacite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (y): Pleochroism (y): pale yellow.
Help on Pleochroism (z): Pleochroism (z): sulfur yellow.

Calculated Properties of Rabejacite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Rabejacite =4.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.004997256
Boson Index = 0.995002744
Help on Photoelectric: Photoelectric: PERabejacite =1,632.20 barns/electron
U=PERabejacite x relectron=6,117.79 barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.06)where (A+ B++)5 (XO4)2 Zq�x(H2O)
  (31.06.08)Dana Group Rabejacite Ca(UO2)4(SO4)2(OH)6•6(H2O) Unk Ortho
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 07.EC.10





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