Strontiomelane Mineral Data

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General Strontiomelane Information

Help on Chemical  Formula: Chemical Formula: SrMn++++6Mn+++2O16
Help on Composition: Composition: Molecular Weight = 783.11 gm
   Strontium  11.19 %  Sr   13.23 % SrO
   Manganese  56.12 %  Mn   20.16 % Mn2O3 / 66.61 % MnO2
   Oxygen     32.69 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SrMn4+6Mn3+2O16
Help on Environment: Environment: Post-Alpine stage of veining. Sr end-member of the cryptomelane group.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Found at the Praborna manganese mine, near Saint-Marcel, Aosta Valley, Italian Alps. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name reflects the presence of strontium and the black color, melanos in Greek.
Help on Synonym: Synonym: IMA1995-005
 

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Strontiomelane Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7367:1:1.7158
Help on Cell Dimensions: Cell Dimensions: a = 10, b = 5.758, c = 9.88, Z = 2; beta = 90.64° V = 568.85 Den(Calc)= 4.57
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.15(1)(103), 3.13(0.8)(103), 2.409(0.8)(122),2.17(0.6)(320), 1.556(0.5)(225),
 

Physical Properties of Strontiomelane

Help on Cleavage: Cleavage: [???] Distinct
Help on Color: Color: Black.
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: sepia brown
 

Optical Properties of Strontiomelane

Help on RL Anisotrophism: RL Anisotrophism: Moderate, from gray-blue to white.
Help on RL Color: RL Color: Gray color in oil.
Help on RL Pleochroism: RL Pleochroism: Strong gray-white in oil.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Strontiomelane in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   34.20   26.00 
   
 543 nm   31.70   24.40 
 587 nm   30.60   23.40 
 657 nm   29.70   22.30 
Calculated Relative Intensity Colors of Strontiomelane in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 380%
R1                        
R2                        
 

Calculated Properties of Strontiomelane

Help on Electron Density: Electron Density:

relectron=4.27 gm/cc
note: rStrontiomelane =4.57 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00798
Boson Index = 0.99202
Help on Photoelectric: Photoelectric:

PEStrontiomelane = 27.51 barns/electron
U=PEStrontiomelane x relectron= 117.53 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strontiomelane is Not Radioactive

 

Strontiomelane Classification

Help on  Dana Class: Dana Class: 7.9.1.5 (7)Multiple Oxides
  (7.9)where A B (O)2
  (7.9.1)Cryptomelane Group (Hard black, fine-grained)
 
7.9.1.1 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m
 
7.9.1.2 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m
 
7.9.1.3 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m
 
7.9.1.4 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m
 
7.9.1.5 Strontiomelane ! SrMn6Mn2O16 P 21/m 2/m
 
7.9.1.6 Henrymeyerite! BaFeTi7O16 I 4/m 4/m
Help on  Strunz Class: Strunz Class: IV/D.08-25 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.08 - Cryptomelane group
 
IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m
 
IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m
 
IV/D.08-25 Strontiomelane SrMn6Mn2O16 P 21/m 2/m
 
IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m
 
IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m
 
IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m
 
IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 41/a 4/m
 
IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 41/a 4/m
 
IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m
 
IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m
 
IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig
 

Other Strontiomelane Information

Help on References: References: NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 85, p628) OPTIC PROP.(AmMin, V 85, p628)
Help on See Also: See Also: Links to other databases for Strontiomelane :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Strontiomelane Specimen Label here :

Strontiomelane

SrMn++++6Mn+++2O16
Dana No: 7.9.1.5 Strunz No: IV/D.08-25
Locality:

 

Notes:

 

 
   
 
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