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Shigaite

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Formula:
Mn6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
System:
Trigonal
Colour:
Deep yellow with black, ...
Name:
Named after its discovery locality.
The Mn analogue of nikischerite.

Classification of Shigaite

Approved
7.DD.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
31.1.2.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq·xH2O, where m:p > 6:1
25.9.8

25 : Sulphates
9 : Sulphates of Mn
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First Recorded Occurrence of Shigaite

Year of Discovery:
1985

Physical Properties of Shigaite

Vitreous, Dull
Diaphaneity (Transparency):
Transparent
Colour:
Deep yellow with black, inhomogenous inclusions

Crystallography of Shigaite

Crystal System:
Trigonal
Cell Parameters:
a = 9.51Å, c = 32.83Å
Ratio:
a:c = 1 : 3.452
Unit Cell Volume:
V 2,571.36 ų (Calculated from Unit Cell)

Optical Data of Shigaite

Type:
Uniaxial (-)

Chemical Properties of Shigaite

Formula:
Mn6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
Essential elements:
All elements listed in formula:

Relationship of Shigaite to other Species

Other Members of Group:
KarchevskyiteMg18Al9(OH)54Sr2(CO3)9(H2O)6 (H3O)5
MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
NatroglaucoceriniteNaxZn8-yAly(SO4)(x+y)/2(OH)16 · 6H2O
NikischeriteFe62+Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
7.DD.05FelsőbányaiteAl4(SO4)(OH)10 · 4H2O
7.DD.10LangiteCu4(SO4)(OH)6 · 2H2O
7.DD.10PosnjakiteCu4(SO4)(OH)6 · H2O
7.DD.10WroewolfeiteCu4(SO4)(OH)6 · 2H2O
7.DD.15SpangoliteCu6Al(SO4)(OH)12Cl · 3H2O
7.DD.20KtenasiteZn(Cu,Zn)4(SO4)2(OH)6 · 6H2O
7.DD.25ChristeliteCu2Zn3(SO4)2(OH)6 · 4H2O
7.DD.30CampigliaiteMn2+Cu4(SO4)2(OH)6 · 4H2O
7.DD.30DevillineCaCu4(SO4)2(OH)6 · 3H2O
7.DD.30OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
7.DD.30SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
7.DD.30NiedermayriteCdCu4(SO4)2(OH)6 · 4H2O
7.DD.30EdwardsiteCu3Cd2(SO4)2(OH)6·4H2O
7.DD.35Carrboydite[(Ni1-xAlx)(OH)2][SO4]x/2 · nH2O
7.DD.35Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2O
7.DD.35Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
7.DD.35Hydrohonessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
7.DD.35MotukoreaiteMg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
7.DD.35Mountkeithite[(Mg1-xFex3+)(OH)2][SO4]x/2 · nH2O
7.DD.35WermlanditeMg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O
7.DD.35WoodwarditeCu1-xAlx(OH)2[SO4]x/2 · nH2O
7.DD.35ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O
7.DD.35Hydrowoodwardite(Cu1-xAlx)(OH)2[SO4]x/2 · nH2O
7.DD.35ZincowoodwarditeZn1-xAlx(OH)2[SO4]x/2 · nH2O
7.DD.35NatroglaucoceriniteNaxZn8-yAly(SO4)(x+y)/2(OH)16 · 6H2O
7.DD.35NikischeriteFe62+Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O
7.DD.40Lawsonbauerite(Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O
7.DD.40Torreyite(Mg,Mn2+)72Mn22+Zn4(SO4)2(OH)22 · 8H2O
7.DD.45MooreiteMg92Mn2Zn4(SO4)2(OH)26 · 8H2O
7.DD.50Namuwite(Zn,Cu)4(SO4)(OH)6 · 4H2O
7.DD.55Bechererite(Zn,Cu)6Zn2(SO4,HSiO4)2(OH)12
7.DD.60Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2O
7.DD.65VonbezingiteCa6Cu3(SO4)3(OH)12 · 2H2O
7.DD.70RedgilliteCu6(SO4)(OH)10 · H2O
7.DD.75ChalcoalumiteCuAl4(SO4)(OH)12 · 3H2O
7.DD.75Nickelalumite(Ni,Cu)Al4(SO4,(NO3)2)(OH)12 · 3H2O
7.DD.75KyrgyzstaniteZnAl4(SO4)(OH)12·3H2O
7.DD.80Guarinoite(Zn,Co,Ni)6(SO4)(OH,Cl)10 · 5H2O
7.DD.80Schulenbergite(Cu,Zn)7(SO4,CO3)2(OH)10 · 3H2O
7.DD.80Thérèsemagnanite(Co,Zn,Ni)6(SO4)(OH,Cl)10 · 8H2O
7.DD.80UM1992-30-SO:CCuHZn(Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O
7.DD.85MontetrisaiteCu6(SO4)(OH)10 · 2H2O
25.9.1SzmikiteMnSO4 · H2O
25.9.2JôkokuiteMnSO4 · 5H2O
25.9.3MallarditeMnSO4 · 7H2O
25.9.4ManganolangbeiniteK2Mn2(SO4)3
25.9.5Chvaleticeite(Mn,Mg)SO4 · 6H2O
25.9.6DespujolsiteCa3Mn4+(SO4)2(OH)6 · 3H2O
25.9.7ApjohniteMn2+Al2(SO4)4 · 22H2O
25.9.9Ilesite(Mn,Zn,Fe)SO4 · 4H2O
25.9.10MooreiteMg92Mn2Zn4(SO4)2(OH)26 · 8H2O
25.9.11Torreyite(Mg,Mn2+)72Mn22+Zn4(SO4)2(OH)22 · 8H2O
25.9.12Lawsonbauerite(Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O
25.9.13Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2O

Other Names for Shigaite

Name in Other Languages:

Other Information

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 Shigaite

Reference List:
American Mineralogist (1986): 71: 1546.

Canadian Mineralogist (1996): 34: 91-98.

Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for Shigaite

Specimens:
The following Shigaite specimens are currently listed for sale on minfind.com.

Localities for Shigaite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Australia
 
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
Pring, A., Francis, G. & Birch, W. D. (1992): Nissonite, namibite, and other additions to the mineral suite from Iron Monarch, South Australia. Australian Mineral. 6, 31-39.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
HORVÁTH, L., PFENNINGER HORVÁTH, E. (2000) I minerali di Mont-Saint-Hilaire (Québec, Canada) Rivista Mineralogica Italiana, XXIV, 140-202 (in Italian with English summary).
Japan
 
  • Honshu Island
    • Kinki Region
      • Shiga Prefecture
        • Ritto City
N.Jahrb.Min.,Mh.(1985) 453-457
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Bruce Cairncross (2000) The Desmond Sacco Collection
      • Kuruman
        • N'Chwaning Mines
Cairncross, B. & Balayer, P. (2007): Neufund: Shigait aus den Kalahari-Manganfeldern, Südafrika. LAPIS 32 (4): 23-26 + 50
Minerals of South Africa
USA
 
  • Michigan
    • Iron Co.
      • Menominee iron range
        • Mineral Hills
Mineralogy of Michigan (2004) Heinrich & Robinson
Shawn Carlson (2010) Mineral News, 26, #11, 1-2 & 9-10.
        • Stambaugh
A. E. Seaman Mineral Museum collection.
A. E. Seaman Mineral Museum collection.
Mineral and/or Locality  
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