Mineralogy Database

Eylettersite Mineral Data

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General Eylettersite Information

Help on Chemical  Formula: Chemical Formula: (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6 (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Th0.4Pb0.1Al3.6(PO4)1.3(SiO4)0.10.5(H4)0.5(O4)(OH)6.1
Help on Environment: Environment: Alteration product of thorian crandallite in a phosphate-rich granite pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Kobokobo pegmatite, Lusungu River district, Kivu Province, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mme. Van Wambeke, wife of the discoverer.
Help on Name Pronunciation: Name Pronunciation: Eylettersite + Pronunciation Say EYLETTERSITE
 

Eylettersite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.38912
Help on Cell Dimensions: Cell Dimensions: a = 6.99, c = 16.7, Z = 3; V = 706.65 Den(Calc)= 3.39
Help on Crystal System: 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/Io): 2.95(1), 3.51(0.6), 5.7(0.55),
 

Physical Properties of Eylettersite

Help on Cleavage: Cleavage: None
Help on Color: Color: Cream white.
Help on Density: Density: 3.38 - 3.44, Average = 3.41
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luminescence: Luminescence: Fluorescent, Short UV=greenish yellow, Long UV=weak cream brown.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Eylettersite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.615-1.66.
 

Calculated Properties of Eylettersite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.24 gm/cc
note: Specific Gravity of Eylettersite =3.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEEylettersite = 495.53 barns/electron
U=PEEylettersite x relectron=1,603.40 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: 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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