Sayrite Mineral Data

General Sayrite Information

Chemical Formula:

Pb2(UO2)5O6(OH)2•4(H2O)

Composition:

Molecular Weight = 1,966.61 gm

Uranium 60.52 % U 68.65 % UO₂

Hydrogen 0.51 % H 4.58 % H₂O

Lead 21.07 % Pb 22.70 % PbO

Oxygen 17.90 % O

______ ______

100.00 % 95.93 % = TOTAL OXIDE

Empirical Formula:

Pb₂(UO₂)₅O₆(OH)₂•4(H₂O)

Environment:

Alteration product of uraninite in the oxidized zone of a uranium orebody.

IMA Status:

Approved IMA 1983

Locality:

Shinkolobwe, Katanga Province, Congo (Shaba Province, Zaire). Link to MinDat.org Location Data.

Name Origin:

Named for David Sayre (1924- ), American crystallographer, State University of New York, Stony Brook, New York, USA.

Name Pronunciation:

Sayrite

Synonym:

ICSD 38374

PDF 35-601

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Sayrite Crystallography

Axial Ratios:

a:b:c =1.5379:1:2.088

Cell Dimensions:

a = 10.704, b = 6.96, c = 14.533, Z = 2; beta = 116.81° V = 966.32 Den(Calc)= 6.76

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.113(1), 3.512(0.9), 7.01(0.8),

Crystal Structure:

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Piret P , Deliens M , Piret-Meunier J , Germain G , Bulletin de Mineralogie , 106 (1983) p.299-304

Physical Properties of Sayrite

Cleavage:

{102} Distinct

Color:

Yellow orange, Red orange.

Density:

6.76

Optical Properties of Sayrite

Gladstone-Dale:

CI meas= -0.222 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.222 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1398,KPDmeas= 0.1398,KC= 0.1144
Ncalc = 1.77

Optical Data:

Biaxial (-), b=1.94, g=1.95,

Calculated Properties of Sayrite

Electron Density:

Bulk Density (Electron Density)=5.57 gm/cc
note: Specific Gravity of Sayrite =6.76 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Sayrite=2,059.44 barns/electron
U=PE_Sayrite x r_electron=11468.10 barns/cc.

Radioactivity:

GRapi = 4,249,243.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Sayrite per GRapi unit = 235.34 (PPB)

Sayrite 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) 7.16 ± 1.79 grams of pure Sayrite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 715.81 ±178.95 grams of pure Sayrite .

**Estimated Radioactivity from Sayrite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 6.56 cm	108,326,404	2.93E-03	4,249,243.79	1,397.01
100 gm / 3.05 cm	10,832,640	2.93E-04	424,924.38	139.70
10 gm / 1.41 cm	1,083,264	2.93E-05	42,492.44	13.97
1 gm / 6.56 mm	108,326	2.93E-06	4,249.24	1.40
0.1 gm / 3.05 mm	10,833	2.93E-07	424.92	0.14
0.01 gm / 1.41 mm	1,083	2.93E-08	42.49	0.01
0.001 gm / 0.66 mm	108	2.93E-09	4.25	0.00

Weight of pure Sayrite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.76 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

Sayrite Classification

Dana Class:

05.09.06.01 (05)Oxides Containing Uranium and Thorium

(05.09)with a cation charge of 6+ containing Pb or Bi and some water of hydration or hydroxyl

(05.09.06)Dana Group

05.09.06.01 Sayrite Pb2(UO2)5O6(OH)2•4(H2O) P 2₁/c 2/m

Strunz Class:

04.GB.50 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.G - Uranyl Hydroxides

04.GB -With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra

04.GB.50 Sayrite Pb2(UO2)5O6(OH)2•4(H2O) P 2₁/c 2/m

Other Sayrite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Sayrite :
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
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Sayrite Specimen Label here :

Sayrite

Pb2(UO2)5O6(OH)2•4(H2O)
Dana No: 05.09.06.01 Strunz No: 04.GB.50
Locality:

Notes: