Cervandonite-(Ce) Mineral Data

Cervandonite-(Ce) Mineral Data
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General Cervandonite-(Ce) Information

Help on Chemical Formula: Chemical Formula: (Ce,Nd,La)(Fe+++,Fe++,Ti++++,Al)3(SiO7)1-x+y(AsO3)1+x-y(OH)3x-3y
Help on Composition: Composition: Molecular Weight = 634.48 gm
   Lanthanum   4.38 %  La    5.14 % La2O3
   Cerium      8.83 %  Ce   10.35 % Ce2O3
   Yttrium     1.40 %  Y     1.78 % Y2O3
   Thorium     3.66 %  Th    4.16 % ThO2
   Titanium    6.79 %  Ti   11.33 % TiO2
   Aluminum    2.13 %  Al    4.02 % Al2O3
   Iron       14.08 %  Fe   13.59 % FeO /  5.03 % Fe2O3
   Silicon     8.41 %  Si   17.99 % SiO2
   Arsenic    12.99 %  As   17.15 % As2O3
   Neodymium   4.55 %  Nd    5.30 % Nd2O3
   Oxygen     32.78 %  O
             ______        ______ 
             100.00 %       95.84 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.4Nd0.2La0.2Y0.1Th0.1Fe2+1.2Ti0.9Al0.5Fe3+0.4Si1.9As1.1O13
Help on Environment: Environment: Fissure veins in gneiss.
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: Locality: Pizzo Cervandone, Alpe Devero, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
 

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Cervandonite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.577:1:0.37
Help on Cell Dimensions: Cell Dimensions: a = 11.269, b = 19.527, c = 7.226, Z = 6; beta = 121.35° V = 1,357.94 Den(Calc)= 4.65
Help on Crystal System: Crystal System: Monoclinic - DomaticH-M Symbol (m) Space Group: Cm ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.8785(1), 3.253(0.9), 5.39(0.8),
Click Here for Large Cervandonite-(Ce) Structure Window Crystal Structure:

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Demartin F , Gramaccioli C M , Graeser S , The Canadian Mineralogist , 46 (2008) p.423-430, The crystal structure of cervandonite-(Ce), an interesting example of, As3+ - Si diadochy, Locality: Alpine fissures at Pizzo Cervandone, Scherbadung, Central Alps, Note: Chemistry from original description of the mineral.

 

Physical Properties of Cervandonite-(Ce)

Help on Cleavage: Cleavage: {001} Indistinct
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brownish black
 

Optical Properties of Cervandonite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.214,KC= 0.2117
Ncalc = 1.98
Help on Optical Data: Optical Data: Biaxial (?), a=1.99, g=2, bire=0.0100
Help on Pleochroism (x): Pleochroism (x): yellow.
Help on Pleochroism (y): Pleochroism (y): yellowish brown.
Help on Pleochroism (z): Pleochroism (z): brown.
 

Calculated Properties of Cervandonite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.31 gm/cc
note: Specific Gravity of Cervandonite-(Ce) =4.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECervandonite-(Ce) = 189.69 barns/electron
U=PECervandonite-(Ce) x relectron= 818.29 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 72,378.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Cervandonite-(Ce) per GRapi unit = 13.82 (PPM)

Cervandonite-(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) 420.25 ±105.06 grams of pure Cervandonite-(Ce) .

Estimated Radioactivity from Cervandonite-(Ce) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Becquerels
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.43 cm 1,638,409 4.43E-05 72,378.27 23.80
100 gm / 3.45 cm 163,841 4.43E-06 7,237.83 2.38
10 gm / 1.60 cm 16,384 4.43E-07 723.78 0.24
1 gm / 7.43 mm 1,638 4.43E-08 72.38 0.02
0.1 gm / 3.45 mm 164 4.43E-09 7.24 0.00
0.01 gm / 1.60 mm 16 4.43E-10 0.72 0.00
0.001 gm / 0.74 mm 2 4.43E-11 0.07 0.00

Weight of pure Cervandonite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.65 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
 

Cervandonite-(Ce) Classification
Help on Dana Class: Dana Class: 43.04.12.01 (43)Compound Phosphates, etc.
  (43.04)(Anhydrous Compound Anions With Hydroxyl or Halogen)
  (43.04.12)Dana Group
 
43.04.12.01 Cervandonite-(Ce) (Ce,Nd,La)(Fe,Fe,Ti,Al)3(SiO7)1-xy(AsO3)1x-y(OH)3x-3y Cm ? m
Help on Strunz Class: Strunz Class: 09.BE.09.2 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.09.2 Cervandonite-(Ce) (Ce,Nd,La)(Fe,Fe,Ti,Al)3(SiO7)1-xy(AsO3)1x-y(OH)3x-3y Cm ? m
 

Other Cervandonite-(Ce) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p932,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Cervandonite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Cervandonite-(Ce)

(Ce,Nd,La)(Fe+++,Fe++,Ti++++,Al)3(SiO7)1-x+y(AsO3)1+x-y(OH)3x-3y
Dana No: 43.04.12.01 Strunz No: 09.BE.09.2
Locality:

 

Notes: