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Stavelotite-(La) Mineral Data

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General Stavelotite-(La) Information

Help on Chemical  Formula: Chemical Formula: La3Mn++3Cu++(Mn+++,Fe+++,Mn++++)26(Si2O7)6O30
Help on Composition: Composition: Molecular Weight = 3,438.35 gm
   Calcium     0.24 %  Ca    0.34 % CaO
   Lanthanum   7.38 %  La    8.66 % La2O3
   Cerium      0.39 %  Ce    0.45 % Ce2O3
   Magnesium   0.66 %  Mg    1.09 % MgO
   Scandium    0.99 %  Sc    1.52 % Sc2O3
   Titanium    0.27 %  Ti    0.45 % TiO2
   Manganese  30.70 %  Mn   32.67 % Mn2O3 /  4.98 % MnO2
   Aluminum    1.80 %  Al    3.41 % Al2O3
   Iron        9.44 %  Fe   13.50 % Fe2O3
   Cobalt      0.15 %  Co    0.19 % CoO
   Copper      1.74 %  Cu    2.18 % CuO
   Silicon     9.73 %  Si   20.82 % SiO2
   Neodymium   3.00 %  Nd    3.50 % Nd2O3
   Oxygen     33.50 %  O
             ______        ______ 
             100.00 %       99.93 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La1.82Nd0.71Ce0.09Ca0.2Sc0.15Mn2+2.99Cu0.94Mn3+0.05Mn3+14.18Fe3+5.81Al2.29 Mn4+1.97Mg0.93Sc0.6Ti0.19Co0.08Si11.91O72
Help on Environment: Environment: Minor accessory mineral in a quartz vein cross-cutting deep purple, highly oxidized manganiferous Ordovician phyllites.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Stavelot Massif at Le Coreux, 1 km north of Salmch´┐Żteau along the western flanks of the Salm river valley, Ardennes, Belgium. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Stavelot Massif in the Belgian Ardennes Mountains, and Stavelot, which is a historical town in eastern Belgium.
Help on Synonym: Synonym: IMA2004-014
 

Stavelotite-(La) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.89344
Help on Cell Dimensions: Cell Dimensions: a = 11.525, c = 33.347, Z = 3; V = 3,835.92 Den(Calc)= 4.47
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: P 31
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.7232(1)(224 ), 1.6635(0.4)(600 ), 2.7789(0.4)(0.0.12 ), 5.446(0.31)(112 ), 2.3702(0.29)(228 )1.6887(0.28)(2.2.16 )3.1873(0.19)(033,303 )11.116(0.18)(003 ),
 

Physical Properties of Stavelotite-(La)

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Unknown - Minerals too small to observe fractures.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Luster: Luster: Metallic
 

Optical Properties of Stavelotite-(La)

Help on Optical Data: Optical Data: Uniaxial (?).
Help on RL Anisotrophism: RL Anisotrophism: Very weak.
Help on RL Bireflectance: RL Bireflectance: Weak to very weak.
Help on RL Color: RL Color: Gray.
Help on RL Pleochroism: RL Pleochroism: Very weak with weak brown internal reflections in oil.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Stavelotite-(La) in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   13.60   14.40 
   
 546 nm   13.20   13.90 
 589 nm   13.00   13.70 
 650 nm   12.80   13.40 
Standardized Intensity (100%) Reflection Spectra of Stavelotite-(La) in Oil
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm    3.00    3.70 
   
 546 nm    2.90    3.50 
 589 nm    2.80    3.40 
 650 nm    2.70    3.20 
Calculated Relative Intensity Colors of Stavelotite-(La) in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 680%
R1                        
R2                        
Calculated Relative Intensity Colors of Stavelotite-(La) in Oil
Relative
Intensity
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000%
R1                      
R2                      
 

Calculated Properties of Stavelotite-(La)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.22 gm/cc
note: Specific Gravity of Stavelotite-(La) =4.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEStavelotite-(La) = 64.68 barns/electron
U=PEStavelotite-(La) x relectron= 272.75 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 10,839.46 (Gamma Ray American Petroleum Institute Units)
Concentration of Stavelotite-(La) per GRapi unit = 92.26 (PPM)

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

Estimated Radioactivity from Stavelotite-(La) - 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 / 7.53 cm 241,281 6.52E-06 10,839.46 3.56
100 gm / 3.50 cm 24,128 6.52E-07 1,083.95 0.36
10 gm / 1.62 cm 2,413 6.52E-08 108.39 0.04
1 gm / 7.53 mm 241 6.52E-09 10.84 0.00
0.1 gm / 3.50 mm 24 6.52E-10 1.08 0.00
0.01 gm / 1.62 mm 2 6.52E-11 0.11 0.00
0.001 gm / 0.75 mm 0 6.52E-12 0.01 0.00

Weight of pure Stavelotite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.47 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 ( 0.54 % Th) From Sum REE Elements (10.77 % REE)
 

Stavelotite-(La) Classification

Help on  Dana Class: Dana Class: 55.04.04.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.04)Dana Group
 
55.04.04.01 Stavelotite-(La)! La3Mn3Cu(Mn,Fe,Mn)26(Si2O7)6O30 P 31 3
Help on  Strunz Class: Strunz Class: 09.BE.87 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.87 Stavelotite-(La)! La3Mn3Cu(Mn,Fe,Mn)26(Si2O7)6O30 P 31 3
 

Other Stavelotite-(La) Information

Help on References: References: NAME( AmMin, v91, p1206) PHYS. PROP.(AmMin, v91, p1206) OPTIC PROP.(AmMin, v91, p1206)
Help on See Also: See Also: Links to other databases for Stavelotite-(La) :
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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Print or Cut-and-Paste your Stavelotite-(La) Specimen Label here :

Stavelotite-(La)

La3Mn++3Cu++(Mn+++,Fe+++,Mn++++)26(Si2O7)6O30
Dana No: 55.04.04.01 Strunz No: 09.BE.87
Locality:

 

Notes:

 

 
   
 


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