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Strontiomelane

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Formula:
Sr(Mn
4+
6
Mn
3+
2
)O
 
16
System:MonoclinicColour:Black
Lustre:Sub-MetallicHardness:4 - 4½
Member of:Coronadite Group > Hollandite Supergroup
Name:The name reflects the presence of strontium and the black color, melanos in Greek.


Cryptomelane Group.

Classification of Strontiomelane

IMA status:Approved
Strunz 8th edition ID:4/D.08-25
Nickel-Strunz 10th (pending) edition ID: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
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Type Occurrence of Strontiomelane

Type Locality:Prabornaz Mine (ex Praborna Mine), Saint-Marcel, Aosta Valley, Italy

Physical Properties of Strontiomelane

Lustre:Sub-Metallic
Diaphaneity (Transparency):Opaque
Colour:Black
Hardness (Mohs):4 - 4½

Crystallography of Strontiomelane

Crystal System:Monoclinic

Chemical Properties of Strontiomelane

Formula:
Sr(Mn
4+
6
Mn
3+
2
)O
 
16
Essential elements:Mn, O, Sr
All elements listed in formula:Mn, O, Sr
Common Impurities:Ba,K

Relationship of Strontiomelane to other Species

Member of:Coronadite Group > Hollandite Supergroup
Other Members of Group:

- +
Coronadite
Pb(Mn
4+
6
Mn
3+
2
)O
 
16
Cryptomelane
K(Mn
4+
7
Mn
3+
 
)O
 
16
Ferrihollandite
Ba(Mn
4+
6
Fe
3+
2
)O
 
16
Hollandite
Ba(Mn
4+
6
Mn
3+
2
)O
 
16
Manjiroite
Na(Mn
4+
7
Mn
3+
 
)O
 
16
Related Minerals - Nickel-Strunz Grouping):

- +
4.DK.05Akaganeite
β-Fe
3+
 
O(OH,Cl)
4.DK.05aCoronadite
Pb(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.05aCryptomelane
K(Mn
4+
7
Mn
3+
 
)O
 
16
4.DK.05aHollandite
Ba(Mn
4+
6
Mn
3+
2
)O
 
16
4.DK.05aManjiroite
Na(Mn
4+
7
Mn
3+
 
)O
 
16
4.DK.05bMannardite
Ba
 
x
Ti
 
8-2x
V
 
2x
O
 
16
·2-xH
 
2
O
4.DK.05bPriderite
(K,Ba)(Ti,Fe)
 
8
O
 
16
4.DK.05bRedledgeite
Ba
 
x
([Cr,Fe,V]
3+
2x
Ti
 
8-2x
)O
 
16
4.DK.05bHenrymeyerite
BaFe
2+
 
Ti
 
7
O
 
16
4.DK.10Romanèchite
(Ba,H
 
2
O)
 
2
Mn
 
5
O
 
10
4.DK.10Todorokite
(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)
 
6
O
 
12
 · 3H
 
2
O

Other Names for Strontiomelane

Synonyms:
IMA1995-005
Other Languages:
German:Strontiomelan
Japanese:ストロンチオメレン

Other Information

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

References for Strontiomelane

Reference List:

- +
N. Meisser, E.-A. Perseil, J. Brugger and P.-J. Chiappero (1999): "Strontiomelane, SrMn4+6Mn3+2O16, a new mineral of the cryptomelane group from St. Marcel-Praborna, Aosta Valley, Italy", Canadian Mineralogist (1999): 37: 673-678.

Internet Links for Strontiomelane

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Strontiomelane details from Handbook of Mineralogy (PDF)
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    • Localities for Strontiomelane

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Belgium
     
    • Luxembourg Province
      • Stavelot Massif
        • Vielsalm
          • Salmchâteau
    		W. Schreyer et al. , Contributions to Mineralogy and Petrology, Vol. 141, Issue 5, 2001, pp. 560-571.
    Italy
     
    • 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.
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