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Aeschynite-(Ce) Mineral Data

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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 Name Pronunciation: Name Pronunciation: Aeschynite-(Ce) + Pronunciation Say AESCHYNITE-(CE)
Help on Synonym: Synonym: Eschynite
  ICSD 20600
  PDF 15-864
 

Aeschynite-(Ce) Image

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  Aeschynite-(Ce)

Comments: Prismatic crystals of Aeschynite-(Ce). Crystals were mined in 1911-1912 during works of Alexandr E. Fersman's Radium Expedition on the mine. Measured radioactivity is 183 µR/h.
Location: Blyumovskaya Pit (Blum Pit; Pit No. 50), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia. Scale: Largest crystal size is 28x16x8 mm.
© Pavel M. Kartashov

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 - Dipyramidal H-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),
 

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 Diaphaneity: Diaphaneity: 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
Ncalc = 2.27 - 2.46
Help on Optical Data: Optical Data: Isotropic, n=2.26.
 

Calculated Properties of Aeschynite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.17 gm/cc
note: Specific Gravity of Aeschynite-(Ce) =4.52 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEAeschynite-(Ce) = 154.95 barns/electron
U=PEAeschynite-(Ce) x relectron= 646.77 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 27,088.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Aeschynite-(Ce) per GRapi unit = 36.92 (PPM)

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 27,088.83 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: 08.03.06.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.06)Aeschynite group
 
08.03.06.01 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
08.03.06.02 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
08.03.06.03 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
08.03.06.04 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 
08.03.06.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
08.03.06.06 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
08.03.06.07 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DF.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DF -With large (� medium-sized) cations; dimers and trimers of edge-sharing octahedra
 
04.DF.05 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
 
04.DF.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
 
04.DF.05 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
 
04.DF.05 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
 
04.DF.05 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m
 
04.DF.05 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Uranium Minerals
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Aeschynite-(Ce) Specimen Label here :

Aeschynite-(Ce)

(Ce,Ca,Fe)(Ti,Nb)2(O,OH)6
Dana No: 08.03.06.01 Strunz No: 04.DF.05
Locality:

 

Notes:

 

 
   
 


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