Pseudo-autunite Mineral Data
General Pseudo-autunite Information
Chemical Formula: (H3O)4Ca2(UO2)2(PO4)4•5(H2O) (?)
Composition: Molecular Weight = 1,166.27 gm
Calcium 6.87 % Ca 9.62 % CaO
Uranium 40.82 % U 46.31 % UO2
Phosphorus 10.62 % P 24.34 % P2 O5
Hydrogen 1.90 % H 16.99 % H2 O
Oxygen 39.78 % O
______ ______
100.00 % 97.26 % = TOTAL OXIDE
Empirical Formula: (H3 O)4 Ca2 (UO2 )2 (PO4 )4 •5(H2 O)
Environment: Fissures and cavities of albite-acmite veins in the contact zone of ultrabasic-alkalic rocks.
IMA Status: Not Approved IMA 1968
Locality: Northern Karelia, Russia. Link to MinDat.org Location Data.
Name Origin: Named for its similarity to autunite and meta-autunite in composition and occurrence.
Synonym: Discredited
Pseudo-autunite Crystallography
Axial Ratios: a:b:c =1:1:1.8452
Cell Dimensions: a = 6.964, b = 6.964, c = 12.85, Z = 1; V = 623.19 Den(Calc)= 3.11
Crystal System: Orthorhombic
X Ray Diffraction: By Intensity(I/Io ): 3.25(1), 6.2(1), 1.92(0.9),
Physical Properties of Pseudo-autunite
Color: Yellow, White.
Density: 3.28
Habit: Platy - Sheet forms (e.g. micas).
Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Hardness: 2-3 - Gypsum-Calcite
Luminescence: Fluorescent and phosphorescent, Short UV=intense yellowish green, Long UV=yellowish green.
Optical Properties of Pseudo-autunite
Gladstone-Dale: CI meas = -0.011 (Superior) - where the CI = (1-KPDmeas /KC ) calc = -0.066 (Fair) - where the CI = (1-KPDcalc /KC )PDcalc = 0.18,KPDmeas = 0.1706,KC = 0.1688
Optical Data: Biaxial (-), a=1.541, b=1.568, g=1.57, bire=0.0290, 2V(Calc)=30, 2V(Meas)=32.
Calculated Properties of Pseudo-autunite
Electron Density: Bulk Density (Electron Density)=3.03 gm/cc
Fermion Index: Fermion Index = 0.0032255628
Photoelectric: PEPseudo-autunite =1,005.29 barns/electronU=PEPseudo-autunite x r electron =3,042.13 barns/cc.
Radioactivity: GRapi = 3,210,039.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Pseudo-autunite per GRapi unit = 311.52 (PPB)
Pseudo-autunite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.
Estimated Maximum U.S. Postal Shipping Size Maximum U.S. Postal Shipping Size
Estimated Radioactivity from Pseudo-autunite
Specimen * Calculated Calculated Estimated Estimated** )/hr
1000 gm / 8.35 cm 73,065,953 1.97E-03 3,210,039.45 1,055.36
100 gm / 3.88 cm 7,306,595 1.97E-04 321,003.95 105.54
10 gm / 1.80 cm 730,660 1.97E-05 32,100.39 10.55
1 gm / 8.35 mm 73,066 1.97E-06 3,210.04 1.06
0.1 gm / 3.88 mm 7,307 1.97E-07 321.00 0.11
0.01 gm / 1.80 mm 731 1.97E-08 32.10 0.01
0.001 gm / 0.84 mm 73 1.97E-09 3.21 0.00
Weight of pure Pseudo-autunite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.28 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
Pseudo-autunite Classification
Dana Class: 40.02a.01.03 (40) Hydrated Phosphates, etc
(40.02a) where A++ (B++)2 (XO4) � x(H2O), containing (UO2)++
(40.02a.01) Autunite Group
40.02a.01.01 Autunite Ca(UO2)2(PO4)2•10-12(H2O) I 4/mmm 4/m 2/m 2/m
40.02a.01.02 Meta-autunite Ca(UO2)2(PO4)2•2-6(H2O) P 4/nmm 4/m 2/m 2/m
40.02a.01.03 Pseudo-autunite * (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho
40.02a.01.04 Sodium meta-autunite ! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m
Strunz Class: 08.XX.00 08 - PHOSPHATES, ARSENATES, VANADATES
08.X - Unclassified Strunz PHOSPHATES, ARSENATES, VANADATES
08.XX -Meta-autunite Group
08.XX.00 Arsenobismite ? Bi2(AsO4)(OH)3 Unk Ortho
08.XX.00 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8•4-5(H2O) P1 1
08.XX.00 Cheralite-(Ce) ? (Ce,Ca,Th)(P,Si)O4 P 21 /n 2/m
08.XX.00 Chernovite-(Ce) * (Ce,Y)(AsO4) I 41 /amd 4/m 2/m 2/m
08.XX.00 Kerstenite ? PbSeO4(?) P nma 2/m 2/m 2/m
08.XX.00 Laubmannite ? Fe3Fe6(PO4)4(OH)12 Unk Ortho
08.XX.00 Spodiosite ? Ca2(PO4)F Pbcm 2/m 2/m 2/m
08.XX.00 Pseudo-autunite * (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho
08.XX.00 Viseite Ca10Al24(SiO4)6(PO4)7O22F3•72(H2O)(?) I a3d 4/m 3 2/m
08.XX.00 Vanuranylite ? (H3O,Ba,Ca,K)1.6(UO2)2V2O8•4(H2O)(?) C 2/c ? 2/m
08.XX.00 Sodium-autunite Na2(UO2)2(PO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m
08.XX.00 Sodium meta-autunite ! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m
08.XX.00 Slavkovite ! Cu13(AsO4)6(AsO3OH)4•23(H2O) P1 1
08.XX.00 IMA2000-020 ! Fe4[AsO3OH]5[AsO2(OH)2]2•20(H2O) Ortho Ortho
08.XX.00 Lewisite ! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m
08.XX.00 Kamarizaite ! Fe3(AsO4)2(OH)3•3H2O Pccm, Pcc2, Pcmm, Pcm21 Ortho
08.XX.00 Lapeyreite ! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m
08.XX.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m
08.XX.00 IMA2009-002 ! Cu3(AsO4)2 P 21 /c 2/m
08.XX.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63 /m 6/m 2/m 2/m
08.XX.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1
Other Pseudo-autunite Information
References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also: Links to other databases for Pseudo-autunite : Am. Min. Crystal Structure Database Athena EUROmin Project GeoScienceWorld Google Images Google Scholar MinDAT Mineralienatlas (Deutsch) Online Mineral Museum QUT Mineral Atlas Ruff.Info Search for Pseudo-autunite using:
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Pseudo-autunite
(H3O)4Ca2(UO2)2(PO4)4•5(H2O) (?) Dana No: 40.02a.01.03 Strunz No: 08.XX.00 Locality:
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Chemical Formula: 
- very strong