Aeschynite-(Ce) Mineral Data + Say AESCHYNITE-(CE)


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General Aeschynite-(Ce) Information
Help on Chemical Formula: Chemical Formula: (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6
Help on Composition: Composition: Molecular Weight = 305.70 gm
   Calcium    3.93 %  Ca    5.50 % CaO
   Cerium    27.50 %  Ce   32.21 % Ce2O3
   Titanium  27.41 %  Ti   45.73 % TiO2
   Niobium    7.60 %  Nb   10.87 % Nb2O5
   Iron       1.83 %  Fe    2.35 % FeO
   Hydrogen   0.33 %  H     2.95 % H2O
   Oxygen    31.40 %  O
            ______        ______ 
            100.00 %       99.61 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.6Ca0.3Fe2+0.1Ti1.75Nb0.25O5(OH)
Help on Environment: Environment: Nepheline syenite rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1828
Help on Locality: Locality: Russia, Chelyabinsk, Il'men Mountians. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition and from the Greek for "shame," in allusion to the inability of chemists, at the time of its discovery, to separate some of its constituents.
Help on Synonym: Synonym: Eschynite
  ICSD 20600
  PDF 15-864
 

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Aeschynite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.6882:1:0.494
Help on Cell Dimensions: Cell Dimensions: a = 7.55, b = 10.97, c = 5.42, Z = 4; V = 448.90 Den(Calc)= 4.52
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.975(1), 3.024(0.8), 3.106(0.35),
Click Here for Large Aeschynite-(Ce) Structure Window Crystal Structure:

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Aleksandrov V B , Doklady Akademii Nauk SSSR , 142 (1962) p.181-184, The crystal structure of aeschynite

 

Physical Properties of Aeschynite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Brownish black, Yellow, Black.
Help on Density: Density: 5.19
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine - Resinous
Help on Streak: Streak: brownish black
 

Optical Properties of Aeschynite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.137 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2788,KPDmeas= 0.2428,KC= 0.2812
Help on Optical Data: Optical Data: Isotropic, n=2.26.
 

Calculated Properties of Aeschynite-(Ce)

Help on Electron Density: Electron Density:

relectron=4.17 gm/cc
note: rAeschynite-(Ce) =4.52 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.03603
Boson Index = 0.96397
Help on Photoelectric: Photoelectric:

PEAeschynite-(Ce) = 154.95 barns/electron
U=PEAeschynite-(Ce) x relectron= 646.77 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 27,088.82 (Gamma Ray American Petroleum Institute Units)

Aeschynite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Aeschynite-(Ce) - weak
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 / 7.50 cm 616,015 1.66E-05 27,088.82 8.91
100 gm / 3.48 cm 61,602 1.66E-06 2,708.88 0.89
10 gm / 1.62 cm 6,160 1.66E-07 270.89 0.09
1 gm / 7.50 mm 616 1.66E-08 27.09 0.01
0.1 gm / 3.48 mm 62 1.66E-09 2.71 0.00
0.01 gm / 1.62 mm 6 1.66E-10 0.27 0.00
0.001 gm / 0.75 mm 1 1.66E-11 0.03 0.00

Weight of pure Aeschynite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.52 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
Estimated Thorium Activity ( 1.38 % Th) From Sum REE Elements (27.50 % REE)
 

Aeschynite-(Ce) Classification
Help on Dana Class: Dana Class: 8.3.6.1 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.3)where A (B2O6)
  (8.3.6)Dana Group
 
8.3.6.1 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
8.3.6.2 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
8.3.6.3 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
8.3.6.4 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 
8.3.6.5 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
8.3.6.6 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: IV/D.21-20 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.21 - Aeschynite series
 
IV/D.21-10 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
IV/D.21-20 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
IV/D.21-30 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
IV/D.21-40 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m
 
IV/D.21-50 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
IV/D.21-60 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
IV/D.21-70 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
 
IV/D.21-80 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 

Other Aeschynite-(Ce) Information
Help on References: References: NAME( Dana8) 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 Aeschynite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Aeschynite-(Ce)

(Ce,Ca,Fe)(Ti,Nb)2(O,OH)6
Dana No: 8.3.6.1 Strunz No: IV/D.21-20
Locality:

 

Notes:

 
 
   
 
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