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Mottanaite-(Ce) Mineral Data

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General Mottanaite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2
Help on Composition: Composition: Molecular Weight = 1,007.13 gm
   Calcium    18.31 %  Ca   25.61 % CaO
   Cerium     20.87 %  Ce   24.44 % Ce2O3
   Thorium     2.30 %  Th    2.62 % ThO2
   Titanium    0.48 %  Ti    0.79 % TiO2
   Beryllium   0.72 %  Be    1.99 % BeO
   Aluminum    1.34 %  Al    2.53 % Al2O3
   Iron        2.22 %  Fe    3.17 % Fe2O3
   Silicon    11.15 %  Si   23.86 % SiO2
   Boron       4.29 %  B    13.83 % B2O3
   Hydrogen    0.05 %  H     0.45 % H2O
   Oxygen     37.33 %  O
   Fluorine    0.94 %  F     0.94 % F
                -   %   F    -0.40 % -O=F2    
             ______        ______ 
             100.00 %       99.84 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Ce1.5Th0.1Ca0.6Al0.5Fe3+0.4Ti0.1Be0.8(Si4B4O22)O(OH)0.5F0.5
Help on Environment: Environment: Miarolitic cavities in alkali-syenitic ejecta enclosed in pyroclastic formations of the Roma Comagmatic Province. (hellandite group; structure)
Help on IMA Status: IMA Status: Approved IMA 2001 (Dana # Added)
Help on Locality: Locality: Sabatini volcanic complex, Latium, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Annibale Mottana, Professor of Mineralogy at the University of Roma Tre (Italy).
Help on Synonym: Synonym: IMA2001-020
 

Mottanaite-(Ce) Image

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  Mottanaite-(Ce)

Comments: Brown crystals of mottanaite-(Ce) in matrix.
Location: Monte Cavallucio, Sacrofano, Campagnano, Latium (Lazio), Italy. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Mottanaite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =4.0101:1:2.1592
Help on Cell Dimensions: Cell Dimensions: a = 19.032, b = 4.746, c = 10.248, Z = 2; beta = 110.97° V = 864.35 Den(Calc)= 3.87
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.854(1)(411), 2.646(0.86)(413), 2.916(0.86)(212), 3.085(0.85)(412), 2.635(0.84)(611), 2.647(0.84)(013), 3.243(0.8)(410), 3.452(0.67)(2
 

Physical Properties of Mottanaite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Pale brown.
Help on Density: Density: 3.61
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Mottanaite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.093 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1793,KPDmeas= 0.1922,KC= 0.1978
Ncalc = 1.71 - 1.77
Help on Optical Data: Optical Data: Biaxial (-), a=1.68, b=1.694, g=1.708, bire=0.0280
 

Calculated Properties of Mottanaite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Mottanaite-(Ce) =3.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMottanaite-(Ce) = 155.80 barns/electron
U=PEMottanaite-(Ce) x relectron= 535.32 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 46,782.29 (Gamma Ray American Petroleum Institute Units)
Concentration of Mottanaite-(Ce) per GRapi unit = 21.38 (PPM)

Mottanaite-(Ce) 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) 650.17 ±162.54 grams of pure Mottanaite-(Ce) .

Estimated Radioactivity from Mottanaite-(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 / 8.09 cm 1,032,168 2.79E-05 46,782.29 15.38
100 gm / 3.75 cm 103,217 2.79E-06 4,678.23 1.54
10 gm / 1.74 cm 10,322 2.79E-07 467.82 0.15
1 gm / 8.09 mm 1,032 2.79E-08 46.78 0.02
0.1 gm / 3.75 mm 103 2.79E-09 4.68 0.00
0.01 gm / 1.74 mm 10 2.79E-10 0.47 0.00
0.001 gm / 0.81 mm 1 2.79E-11 0.05 0.00

Weight of pure Mottanaite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.61 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
 

Mottanaite-(Ce) Classification

Help on  Dana Class: Dana Class: 54.02.02.05 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.02)Hellandite group
 
54.02.02.01 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.02 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.03 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.04 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.05 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m
 
54.02.02.06 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m
 
54.02.02.07 Piergorite-(Ce)! Ca8Ce2(Al0.5Fe0.5)([],Li,Be)2Si6B8O36(OH,F)2 P 2/a 2/m
Help on  Strunz Class: Strunz Class: 09.DK.20 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DK -Inosilicates with 5-periodic single chains
 
09.DK.20 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m
 
09.DK.20 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m
 

Other Mottanaite-(Ce) Information

Help on References: References: NAME( AmMin, Vol 87, p 739) PHYS. PROP.(AmMin, Vol 87, p 739) OPTIC PROP.(AmMin, Vol 87, p 739)
Help on See Also: See Also: Links to other databases for Mottanaite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Mottanaite-(Ce)

Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2
Dana No: 54.02.02.05 Strunz No: 09.DK.20
Locality:

 

Notes:

 

 
   
 


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