Eylettersite Mineral Data

General Eylettersite Information

Chemical Formula:

(Th,Pb)1-xAl3(PO4,SiO4)2(OH)6 (?)

Composition:

Molecular Weight = 481.10 gm

Thorium 19.29 % Th 21.95 % ThO₂

Aluminum 20.19 % Al 38.15 % Al₂O₃

Silicon 0.58 % Si 1.25 % SiO₂

Phosphorus 8.37 % P 19.18 % P₂O₅

Hydrogen 1.70 % H 15.17 % H₂O

Lead 4.31 % Pb 4.64 % PbO

Oxygen 45.56 % O

______ ______

100.00 % 100.33 % = TOTAL OXIDE

Empirical Formula:

Th_0.4Pb_0.1Al_3.6(PO₄)_1.3(SiO₄)_0.10.5(H₄)0.5(O₄)(OH)_6.1

Environment:

Alteration product of thorian crandallite in a phosphate-rich granite pegmatite.

IMA Status:

Approved IMA 1972

Locality:

Kobokobo pegmatite, Lusungu River district, Kivu Province, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for Mme. Van Wambeke, wife of the discoverer.

Name Pronunciation:

Eylettersite + Pronunciation

Eylettersite Crystallography

Axial Ratios:

a:c = 1:2.38912

Cell Dimensions:

a = 6.99, c = 16.7, Z = 3; V = 706.65 Den(Calc)= 3.39

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.95(1), 3.51(0.6), 5.7(0.55),

Physical Properties of Eylettersite

Cleavage:

None

Color:

Cream white.

Density:

3.38 - 3.44, Average = 3.41

Diaphaneity:

Transparent to Translucent

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Hardness:

3-4 - Calcite-Fluorite

Luminescence:

Fluorescent, Short UV=greenish yellow, Long UV=weak cream brown.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Eylettersite

Gladstone-Dale:

CI meas= 0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.109 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1881,KPDmeas= 0.187,KC= 0.2111
Ncalc = 1.71 - 1.73

Optical Data:

Uniaxial (-), e=1.615-1.66.

Calculated Properties of Eylettersite

Electron Density:

Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Eylettersite =3.39 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Eylettersite= 495.53 barns/electron
U=PE_Eylettersite x r_electron=1,603.40 barns/cc.

Radioactivity:

GRapi = 392,835.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Eylettersite per GRapi unit = 2.55 (PPM)

Eylettersite 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) 77.43 ± 19.36 grams of pure Eylettersite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 7742.9 ±1935.7 grams of pure Eylettersite .

**Estimated Radioactivity from Eylettersite** - 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 / 8.26 cm	8,642,961	2.34E-04	392,835.20	129.15
100 gm / 3.83 cm	864,296	2.34E-05	39,283.52	12.92
10 gm / 1.78 cm	86,430	2.34E-06	3,928.35	1.29
1 gm / 8.26 mm	8,643	2.34E-07	392.84	0.13
0.1 gm / 3.83 mm	864	2.34E-08	39.28	0.01
0.01 gm / 1.78 mm	86	2.34E-09	3.93	0.00
0.001 gm / 0.83 mm	9	2.34E-10	0.39	0.00

Weight of pure Eylettersite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.39 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

Eylettersite Classification

Dana Class:

41.05.12.02 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.12)Waylandite Group

41.05.12.01 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

41.05.12.02 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

41.05.12.03 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

41.05.12.04 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

Strunz Class:

08.BL.13 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.13 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

08.BL.13 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

08.BL.13 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.13 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

08.BL.13 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Eylettersite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Eylettersite :
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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Print or Cut-and-Paste your Eylettersite Specimen Label here :

Eylettersite

(Th,Pb)1-xAl3(PO4,SiO4)2(OH)6 (?)
Dana No: 41.05.12.02 Strunz No: 08.BL.13
Locality:

Notes:

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