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Strontiomelane

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Formula:
Sr(Mn4+6Mn3+2)O16
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
4 - 4½
Specific Gravity:
4.66 (Calculated)
Crystal System:
Monoclinic
Name:
Named in 1999 by Nicolas Meisser, Elena-Adriana Perseil, Joel Brugger, Pierre-Jaques Chiappero of the presence of strontium and the black color, μελανός in Greek.
Coronadite Group. Many manganese oxides are better identified using infra-red spectroscopy than by x-ray diffraction because of issues of crystal size, disorder, etc. (Potter and Rossman, 1979).


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Classification of StrontiomelaneHide

Approved
4.DK.05a

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
K : With large (+- medium-sized) cations; tunnel structures

Physical Properties of StrontiomelaneHide

Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Sepia, brown
Hardness:
4 - 4½ on Mohs scale
Hardness:
VHN100=398 kg/mm2 - Vickers
Tenacity:
Brittle
Density:
4.66 g/cm3 (Calculated)
Comment:
Natural material unsuitable for physical measurement

Chemical Properties of StrontiomelaneHide

Formula:
Sr(Mn4+6Mn3+2)O16
Common Impurities:
Ba,K

Crystallography of StrontiomelaneHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 10.00 Å, b = 5.758 Å, c = 9.881 Å
Ratio:
a:b:c = 1.737 : 1 : 1.716
Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Black elongated inclusions (100-200 μm) in black braunite, quartz, violan, or strontiopiemontite.
Comment:
P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.02 (l0)
4.96 (30)
3.52 (30)
3.50 (30)
3.15 (100)
3.13 (80)
2.86 (5)
2.75 (30)
2.504 (5)
2.481 (>5)
2.409 (80)
2.229 (40)
2.217 (30)
2.170 (60)
1.997 (10)
1.982 (5)
1.937 (5)
l.855 (30)
1.843 (30)
1.772 (>5)
1.749 (>5)
1.702 (5)
1.668 (20)
1.648 (20)
1.556 (50)
1.436 (20)
1.369 (20)
1.355 (20)
1.303 (20)
Comments:
Meisser, Perseil, Brugger, and Chiappero (1999)

Type Occurrence of StrontiomelaneHide

General Appearance of Type Material:
Strontiomelane occurs as thin (100-200 pm), submetallic, black, elongate xenomorphic inclusions commonly aggregated with braunite in quartz and,
more rarely, in violet pyroxene (variety
"violan" of diopside-aegirine-jadeite) and in strontiopiemontite.
Geological Setting of Type Material:
Manganese-enriched horizons are embedded in a 4-8 m thick quartzitic layer that represents the basal part of the sedimentary cover of an ophiolitic sequence, tectonically related to the Piemont Nappe.
Associated Minerals at Type Locality:

Synonyms of StrontiomelaneHide

Other Language Names for StrontiomelaneHide

Simplified Chinese:黑锰锶矿
Traditional Chinese:黑錳鍶礦

Relationship of Strontiomelane to other SpeciesHide

Other Members of this group:
CoronaditePb(Mn4+6Mn3+2)O16Mon. 2/m
CryptomelaneK(Mn4+7Mn3+)O16Mon. 2/m
FerricoronaditePb(Mn4+6Fe3+2)O16Tet. 4/m : I4/m
FerrihollanditeBa(Mn4+6Fe3+2)O16Mon. 2/m
HollanditeBa(Mn4+6Mn3+2)O16Mon. 2/m
ManjiroiteNa(Mn4+7Mn3+)O16Tet. 4/m : I4/m

Related Minerals - Nickel-Strunz GroupingHide

4.DK.FerrihollanditeBa(Mn4+6Fe3+2)O16Mon. 2/m
4.DK.05Akaganeite(Fe3+,Ni2+)8(OH,O)16Cl1.25 · nH2OMon. 2/m
4.DK.05aCoronaditePb(Mn4+6Mn3+2)O16Mon. 2/m
4.DK.05aCryptomelaneK(Mn4+7Mn3+)O16Mon. 2/m
4.DK.05aHollanditeBa(Mn4+6Mn3+2)O16Mon. 2/m
4.DK.05aManjiroiteNa(Mn4+7Mn3+)O16Tet. 4/m : I4/m
4.DK.05bMannarditeBa(Ti4+6V3+2)O16Tet. 4/m : I41/a
4.DK.05bPrideriteK(Ti4+7Fe3+)O16Tet.
4.DK.05bRedledgeiteBa(Ti4+6Cr3+2)O16Tet.
4.DK.05bHenrymeyeriteBa(Ti4+7Fe2+)O16Tet. 4/m : I4/m
4.DK.10Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10Mon. 2/m
4.DK.10Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2OMon. 2/m : P2/m

Fluorescence of StrontiomelaneHide

Not fluorescent in UV

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for StrontiomelaneHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Potter, Russell M. and Rossman, George R. (1979): The tetravalent manganese oxides: identification, hydration, and structural relationships by infrared spectroscopy. American Mineralogist, 64, 1199-1218.
Meisser, N., Perseil, E.-A., Brugger, J. and Chiappero, P.-J. (1999): Strontiomelane, SrMn4+6Mn3+2O16, a new mineral species of the cryptomelane group from St. Marcel - Praborna, Aosta Valley, Italy. Canadian Mineralogist 37, 673-678.

Internet Links for StrontiomelaneHide

Localities for StrontiomelaneHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Belgium
 
  • Luxembourg Province
    • Stavelot Massif
      • Vielsalm
        • Salmchâteau
Schreyer W. et al. , Contributions to Mineralogy and Petrology, Vol. 141, Issue 5, 2001, pp. 560-571.
Italy (TL)
 
  • Aosta Valley
    • Saint-Marcel
N. Meisser et al.: Canadian Mineralogist 37:673-678 (1999)
Japan
 
  • Kyushu Region
    • Nagasaki Prefecture
      • Nagasaki City
        • Kinkai-Tone-machi
Fukushima et al (2004) Koubutsu-Gakkai Kou'en-Youshi, 207.
Mineral and/or Locality  
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