Ekanite Mineral Data + Say EKANITE

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General Ekanite Information

Help on Chemical  Formula: Chemical Formula: ThCa2Si8O20
Help on Composition: Composition: Molecular Weight = 856.87 gm
   Calcium   9.35 %  Ca   13.09 % CaO
   Thorium  27.08 %  Th   30.81 % ThO2
   Silicon  26.22 %  Si   56.10 % SiO2
   Oxygen   37.34 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: ThCa2Si8O20
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 64745
  PDF 35-532
 

Ekanite Image

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Ekanite

Comments: Complex specimen of many minerals, most notable are four red ekanite crystals (rare!) scattered around the specimen.
Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Qu?bec, Canada. Scale: 6x4x4 cm.
© John Betts - Fine Minerals

Ekanite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.99024
Help on Cell Dimensions: Cell Dimensions: a = 7.483, c = 14.893, Z = 2; V = 833.94 Den(Calc)= 3.41
Help on Crystal System: Crystal System: Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: I 422
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.14(1), 3.34(0.96), 6.69(0.61),
Click Here for Large Ekanite Structure Window Crystal Structure:

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Szymanski J T , Owens D R , Roberts A C , Ansell H G , Chao G Y , The Canadian Mineralogist , 20 (1982) p.65-75, A mineralogical study and crystal-structure determination of, nonmetamict ekanite, ThCa2Si8O20, Note: Changed O2-x coordinate to match reported bond lengths

 

Physical Properties of Ekanite

Help on Cleavage: Cleavage: [101] Distinct
Help on Color: Color: Green, Yellow, Dark red.
Help on Density: Density: 3.08
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Ekanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1683,KPDmeas= 0.1864,KC= 0.1956
Help on Optical Data: Optical Data: Uniaxial (-), e=1.568, w=1.58, bire=0.0120.
 

Calculated Properties of Ekanite

Help on Electron Density: Electron Density:

relectron=2.89 gm/cc
note: rEkanite =3.08 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01255
Boson Index = 0.98745
Help on Photoelectric: Photoelectric:

PEEkanite = 609.37 barns/electron
U=PEEkanite x relectron=1,761.05 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 542,060.77 (Gamma Ray American Petroleum Institute Units)

Ekanite 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) 56.11 ± 14.03 grams of pure Ekanite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5611.3 ±1402.8 grams of pure Ekanite .

Estimated Radioactivity from Ekanite - 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 / 8.53 cm 12,131,773 3.28E-04 542,060.77 178.21
100 gm / 3.96 cm 1,213,177 3.28E-05 54,206.08 17.82
10 gm / 1.84 cm 121,318 3.28E-06 5,420.61 1.78
1 gm / 8.53 mm 12,132 3.28E-07 542.06 0.18
0.1 gm / 3.96 mm 1,213 3.28E-08 54.21 0.02
0.01 gm / 1.84 mm 121 3.28E-09 5.42 0.00
0.001 gm / 0.85 mm 12 3.28E-10 0.54 0.00

Weight of pure Ekanite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.08 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
 

Ekanite Classification

Help on  Dana Class: Dana Class: 72.1.1.1 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.1)with 4-membered rings
  (72.1.1)Dana Group
 
72.1.1.1 Ekanite ThCa2Si8O20 I 422 4 2 2
Help on  Strunz Class: Strunz Class: VIII/E.10-10 VIII - Silicates
  VIII/E - Cyklosilicates, double quadruplet rings [Si8O20]8-
  VIII/E.10 - Ekanite - Steacyite series
 
VIII/E.10-10 Ekanite ThCa2Si8O20 I 422 4 2 2
 
VIII/E.10-20 Iraqite-(La) K(La,Ce,Th)2(Ca,Na)4(Si,Al)16O40 P 4/mcc 4/m 2/m 2/m
 
VIII/E.10-30 Steacyite K1-x(Ca,Na)2ThSi8O20(x=0.2to0.4) P 4/mcc 4/m 2/m 2/m
 
VIII/E.10-40 Turkestanite! Th(Ca,Na)2(K1-x,[]x)Si8O20·n(H2O) P 4/mcc 4/m 2/m 2/m
 

Other Ekanite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ekanite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - Uranium Minerals 16 - WWW-MINCRYST 17 -École des Mines de Paris

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

Ekanite

ThCa2Si8O20
Dana No: 72.1.1.1 Strunz No: VIII/E.10-10
Locality:

 

Notes:

 

 
   
 
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