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Natroalunite-2c

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Formula:
(Na,Ca0.5,K)Al3(SO4)2(OH)6
System:
Trigonal
Hardness:
3 - 4
Name:
Originally named minamiite for Dr. A. E. Minami (1899-1977), later renamed natroalunite-2c for the structural relation (doubled c-axis) to natroalunite.
Alunite Group.
Originally named minamiite; renamed natroalunite-2c.

Classification of Natroalunite-2c

Renamed approved 2010
7.BC.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
C : With medium-sized and large cations
30.2.4.5

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)2(XO4)Zq
25.6.19

25 : Sulphates
6 : Sulphates of Al and Tl
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First Recorded Occurrence of Natroalunite-2c

Year of Discovery:
1982

Physical Properties of Natroalunite-2c

Hardness (Mohs):
3 - 4
Density:
2 g/cm3 (Calculated)

Crystallography of Natroalunite-2c

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 6.98Å, c = 33.49Å
Ratio:
a:c = 1 : 4.798
Unit Cell Volume:
V 1,413.05 ų (Calculated from Unit Cell)

Chemical Properties of Natroalunite-2c

Formula:
(Na,Ca0.5,K)Al3(SO4)2(OH)6
Essential elements:
All elements listed in formula:

Relationship of Natroalunite-2c to other Species

Other Members of Group:
AluniteKAl3(SO4)2(OH)6
Ammonioalunite(NH4)Al3(SO4)2(OH)6
Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
ArgentojarositeAgFe33+(SO4)2(OH)6
Beaverite-(Cu)Pb(Fe3+,Cu)3(SO4)2(OH)6
Beaverite-(Zn)Pb(Fe23+Zn)(SO4)2(OH)6
DorallchariteTlFe33+(SO4)2(OH)6
HuangiteCa0.5Al3(SO4)2(OH)6
Hydroniumjarosite(H3O)Fe33+(SO4)2(OH)6
JarositeKFe3+ 3(SO4)2(OH)6
NatroaluniteNaAl3(SO4)2(OH)6
NatrojarositeNaFe3(SO4)2(OH)6
OsarizawaitePb(Al,Cu)3(SO4)2(OH)6
PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Schlossmacherite(H3O)Al3(SO4)2(OH)6
WalthieriteBa0.5Al3(SO4)2(OH)6
7.BC.05D'AnsiteNa21Mg(SO4)10Cl3
7.BC.10AluniteKAl3(SO4)2(OH)6
7.BC.10Ammonioalunite(NH4)Al3(SO4)2(OH)6
7.BC.10Ammoniojarosite(NH4)Fe33+(SO4)2(OH)6
7.BC.10ArgentojarositeAgFe33+(SO4)2(OH)6
7.BC.10Beaverite-(Cu)Pb(Fe3+,Cu)3(SO4)2(OH)6
7.BC.10DorallchariteTlFe33+(SO4)2(OH)6
7.BC.10HuangiteCa0.5Al3(SO4)2(OH)6
7.BC.10Hydroniumjarosite(H3O)Fe33+(SO4)2(OH)6
7.BC.10JarositeKFe3+ 3(SO4)2(OH)6
7.BC.10NatroaluniteNaAl3(SO4)2(OH)6
7.BC.10NatrojarositeNaFe3(SO4)2(OH)6
7.BC.10OsarizawaitePb(Al,Cu)3(SO4)2(OH)6
7.BC.10PlumbojarositePb0.5Fe33+(SO4)2(OH)6
7.BC.10Schlossmacherite(H3O)Al3(SO4)2(OH)6
7.BC.10WalthieriteBa0.5Al3(SO4)2(OH)6
7.BC.10Beaverite-(Zn)Pb(Fe23+Zn)(SO4)2(OH)6
7.BC.15Ye'elimiteCa4Al6(SO4)O12
7.BC.20AtlasoviteK(BiO)Cu6Fe3+(SO4)5O3Cl
7.BC.20NabokoiteKCu7(SO4)5(Te4+O3)OCl
7.BC.25ChlorothioniteK2Cu(SO4)Cl2
7.BC.30EuchlorineKNaCu3(SO4)3O
7.BC.30FedotoviteK2Cu3(SO4)3O
7.BC.35KamchatkiteKCu3(SO4)2OCl
7.BC.40PiypiteK2Cu2(SO4)2O
7.BC.45KlyuchevskiteK3Cu3(Fe3+,Al)(SO4)4O2
7.BC.45AlumoklyuchevskiteK3Cu3(Al,Fe3+)(SO4)4O2
7.BC.50CaledonitePb5Cu2(SO4)3(CO3)(OH)6
7.BC.55WherryitePb7Cu2(SO4)4(SiO4)2(OH)2
7.BC.60MammothitePb6Cu4AlSb5+O2(OH)16Cl4(SO4)2
7.BC.65LinaritePbCu(SO4)(OH)2
7.BC.65SchmiederitePb2Cu2(Se6+O4)(Se4+O3)(OH)4
7.BC.65MunakataitePb2Cu2(Se4+O3)(SO4)(OH)4
7.BC.70ChenitePb4Cu(SO4)2(OH)6
7.BC.75KrivovichevitePb3Al(SO4)(OH)7
7.BC.80AnhydrokainiteKMg(SO4)Cl
25.6.1RostiteAl(SO4)(OH) · 5H2O
25.6.2JurbaniteAl(SO4)(OH) · 5H2O
25.6.3KhademiteAl(SO4)F · 5H2O
25.6.4Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
25.6.5AluminiteAl2(SO4)(OH)4 · 7H2O
25.6.6Meta-alunogenAl2(SO4)3 · 12H2O
25.6.7AlunogenAl2(SO4)3 · 17H2O
25.6.8FelsőbányaiteAl4(SO4)(OH)10 · 4H2O
25.6.9Basaluminite
25.6.10HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
25.6.11ZaheriteAl12(SO4)5(OH)26 · 20H2O
25.6.12TamarugiteNaAl(SO4)2 · 6H2O
25.6.13MendoziteNaAl(SO4)2 · 11H2O
25.6.14Alum-(Na)NaAl(SO4)2 · 12H2O
25.6.15NatroaluniteNaAl3(SO4)2(OH)6
25.6.16KaliniteKAl(SO4)2 · 11H2O Not confirmed
25.6.17Alum-(K)KAl(SO4)2 · 12H2O
25.6.18AluniteKAl3(SO4)2(OH)6
25.6.20Tschermigite(NH4)Al(SO4)2 · 12H2O

Other Names for Natroalunite-2c

Name in Other Languages:
German:Minamiit
Spanish:Minamiita

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 Natroalunite-2c

Reference List:
Ossaka, J., Hirabahashi, J.-I., Okada, K., Kobayashi, R. & Hayashi, T. (1982): Crystal structure of minamiite, a new mineral of the alunite group. American Mineralogist: 67: 114-119.

Bayliss, P., Kolitsch, U., Nickel, E.H., Pring, A. (2010): Alunite supergroup: recommended nomenclature. Mineralogical Magazine, 74, 919-927.

Internet Links for Natroalunite-2c

Localities for Natroalunite-2c

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.
Bulgaria
 
  • Pazardzhik Oblast (Pazardjik Oblast)
    • Panagyurishte (Panagurishte) Obshtina
      • Popintsi
Hikov, C. A. (2004): Huangite and Minamiite from Petelovo Deposit, Central Srednogorie. Comptes Rendus de l'Académie Bulgare des Sciences 57, 59-64.
Chile
 
  • Tarapacá Region
    • El Tamarugal Province
      • Pampa del Tamarugal
Peter G. Seroka collection
Japan
 
  • Honshu Island
    • Kanto Region
      • Gunma Prefecture
Amer.Min.(1982) 67, 114-119; Mineralogical Journal Vol. 20 (1998) , No. 1 pp 1-8
  • Kyushu Region
    • Kagoshima Prefecture
      • Satsuma Peninsula
        • Iwato mine
Econ Geol (1989) 84:663-675
  • Tokyo Metropolis
    • Izu Archipelago
      • Aogashima
PXRD by John Attard, 27-02-2015, on material field-collected by Alfredo Petrov, 4-2014.
Mineral and/or Locality  
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