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Strontiomelane Mineral Data
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General Strontiomelane Information
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 Chemical Formula: |
SrMn++++6Mn+++2O16 |
| Composition: |
Molecular Weight = 783.11 gm |
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Strontium 11.19 % Sr 13.23 % SrO |
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Manganese 56.12 % Mn 20.16 % Mn2O3 / 66.61 % MnO2 |
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Oxygen 32.69 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
SrMn4+6Mn3+2O16 |
| Environment: |
Post-Alpine stage of veining. Sr end-member of the cryptomelane group. |
| IMA Status: |
Approved IMA 1999 (Dana # Added) |
| Locality: |
Found at the Praborna manganese mine, near Saint-Marcel, Aosta Valley, Italian Alps. Link to MinDat.org Location Data. |
| Name Origin: |
The name reflects the presence of strontium and the black color, melanos in Greek. |
| Synonym: |
IMA1995-005 |
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Strontiomelane Image |
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Images:
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Strontiomelane
Comments: BSE image of strontiomelane. (CanMin, v37:673).
Location: Praboma mine near Saint-Marcel, Aosta Valley, Italian Alps, Italy.
Scale: Scale Bar 100 µm.
© Canadian Mineralogist |
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Strontiomelane Crystallography
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| Axial Ratios: |
a:b:c =1.7367:1:1.7158 |
| Cell Dimensions: |
a = 10, b = 5.758, c = 9.88, Z = 2; beta = 90.64° V = 568.85 Den(Calc)= 4.57 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m |
| 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), |
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Physical Properties of Strontiomelane
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| Cleavage: |
{???} Distinct |
| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
4-4.5 - Between Fluorite and Apatite |
| Luster: |
Sub Metallic |
| Streak: |
sepia brown |
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Optical Properties of Strontiomelane
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| Optical Data: |
NCalc= 2.56 - from Gladstone-Dale relationship (KC = 0.3423) where Ncalc=Dcalc*KC+1
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| RL Anisotrophism: |
Moderate, from gray-blue to white. |
| RL Color: |
Gray color in oil. |
| RL Pleochroism: |
Strong gray-white in oil. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Strontiomelane in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
34.20 |
26.00 |
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| 543 nm |
31.70 |
24.40 |
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| 587 nm |
30.60 |
23.40 |
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| 657 nm |
29.70 |
22.30 |
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Calculated Relative Intensity Colors of Strontiomelane in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
380% |
| R1 |
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| R2 |
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Calculated Properties of Strontiomelane
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| Electron Density: |
Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Strontiomelane =4.57 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0079889633
Boson Index = 0.9920110367 |
| Photoelectric: |
PEStrontiomelane = 27.51 barns/electron
U=PEStrontiomelane x rElectron Density= 117.53 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strontiomelane is Not Radioactive |
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Strontiomelane Classification
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| Dana Class: |
07.09.01.05 (07)Multiple Oxides |
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(07.09)Dana Type |
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(07.09.01)Cryptomelane Group (Hard black, fine-grained) |
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07.09.01.01 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m |
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07.09.01.02 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m |
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07.09.01.03 Manjiroite (Na,K)(Mn,Mn)8O16•n(H2O) I 4/m 4/m |
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07.09.01.04 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m |
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07.09.01.05 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m |
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07.09.01.06 Henrymeyerite! BaFeTi7O16 I 4/m 4/m |
| Strunz Class: |
04.DK.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.D - Metal:Oxygen = 1:2 and similar |
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04.DK -With large (� medium-sized) cations; tunnel structures |
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04.DK.10 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m |
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04.DK.10 Todorokite (Na,Ca,K)2(Mn,Mn)6O12•3-4.5(H2O) P 2/m 2/m |
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04.DK.10 Romanechite (Ba,H2O)2(Mn,Mn)5O10 C 2/m 2/m |
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04.DK.10 Strontiomelane! SrMn6Mn2O16 P 21/m 2/m |
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Other Strontiomelane Information
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| References: |
NAME( CanMin, 8/99) PHYS. PROP.(AmMin, V 85, p628) OPTIC PROP.(AmMin, V 85, p628) |
| See Also: |
Links to other databases for Strontiomelane :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
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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Strontiomelane
SrMn++++6Mn+++2O16
Dana No: 07.09.01.05 Strunz No: 04.DK.10
Locality:
Notes:
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