Natroalunite-2c
A material that is NOT an approved mineral species
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About Natroalunite-2c
Formula:
(Na,Ca0.5,K)Al3(SO4)2(OH)6
Hardness:
3 - 4
Specific Gravity:
2 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Originally named minamiite for Dr. A. E. Minami (1899-1977), later renamed natroalunite-2c for the structural relation (doubled c-axis) to natroalunite.
First Recorded Locality:
Unique Identifiers
Mindat ID:
2715
Long-form identifier:
mindat:1:1:2715:7
GUID
(UUID V4):
(UUID V4):
d8b8a42f-4e6a-4ecf-b5a5-c156ae9b21a8
IMA Classification of Natroalunite-2c
IMA status notes:
Published without approval
Approval history:
Published without approval: 2010
Classification of Natroalunite-2c
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
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
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
2 : (AB)2(XO4)Zq
25.6.19
25 : Sulphates
6 : Sulphates of Al and Tl
25 : Sulphates
6 : Sulphates of Al and Tl
Physical Properties of Natroalunite-2c
Hardness:
3 - 4 on Mohs scale
Density:
2 g/cm3 (Calculated)
Chemistry of Natroalunite-2c
Mindat Formula:
(Na,Ca0.5,K)Al3(SO4)2(OH)6
Crystallography of Natroalunite-2c
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 6.98 Å, c = 33.49 Å
Ratio:
a:c = 1 : 4.798
Unit Cell V:
1,413.05 ų (Calculated from Unit Cell)
First Recorded Occurrence of Natroalunite-2c
Synonyms of Natroalunite-2c
Other Language Names for Natroalunite-2c
Relationship of Natroalunite-2c to other Species
Member of:
Other Members of this group:
Alunite | KAl3(SO4)2(OH)6 | Trig. 3m : R3m |
Ammonioalunite | (NH4)Al3(SO4)2(OH)6 | Trig. |
Ammoniojarosite | (NH4)Fe3+3(SO4)2(OH)6 | Trig. 3m : R3m |
Argentojarosite | AgFe3+3(SO4)2(OH)6 | Trig. 3m : R3m |
Beaverite-(Cu) | Pb(Fe3+2Cu)(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Beaverite-(Zn) | Pb(Fe3+2Zn)(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Dorallcharite | TlFe3+3(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Huangite | Ca0.5Al3(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Hydroniumjarosite | (H3O)Fe3+3(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Jarosite | KFe3+3(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Natroalunite | NaAl3(SO4)2(OH)6 | Trig. 3m : R3m |
Natrojarosite | NaFe3(SO4)2(OH)6 | Trig. 3m : R3m |
Osarizawaite | Pb(Al2Cu2+)(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Plumbojarosite | Pb0.5Fe3+3(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Schlossmacherite | (H3O)Al3(SO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
Walthierite | Ba0.5Al3(SO4)2(OH)6 | Trig. |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
7.BC. | Adranosite-(Fe) | (NH4)4NaFe3+2(SO4)4Cl(OH)2 |
7.BC. | Adranosite | (NH4)4NaAl2(SO4)4Cl(OH)2 |
7.BC. | D'Ansite-(Mn) | Na21Mn2+(SO4)10Cl3 |
7.BC. | Agaite | Pb3CuTeO5(OH)2(CO3) |
7.BC. | D'Ansite-(Fe) | Na21Fe2+(SO4)10Cl3 |
7.BC. | Acmonidesite | (NH4,K,Pb)8NaFe2+4(SO4)5Cl8 |
7.BC. | Backite | Pb2AlTeO6Cl |
7.BC. | Hagstromite | Pb8Cu2+(Te6+O6)2(CO3)Cl4 |
7.BC. | Wildcatite | CaFe3+Te6+O5(OH) |
7.BC. | Franksousaite | PbCu(Se6+O4)(OH)2 |
7.BC. | Zincochenite | Pb4Zn(OH)6(SO4)2 |
7.BC. | Viskontite | Pb5Cu2(SO4)3(SeO3)(OH)6 |
7.BC.05 | D'Ansite | Na21Mg(SO4)10Cl3 |
7.BC.07 | Apatelite | Fe3(SO4)2(OH)5 · 0.5H2O |
7.BC.07 | Unnamed (Ba-Fe Vanadate) | Ba, Fe, V, O, H |
7.BC.10 | Alunite | KAl3(SO4)2(OH)6 |
7.BC.10 | Ammonioalunite | (NH4)Al3(SO4)2(OH)6 |
7.BC.10 | Ammoniojarosite | (NH4)Fe3+3(SO4)2(OH)6 |
7.BC.10 | Argentojarosite | AgFe3+3(SO4)2(OH)6 |
7.BC.10 | Beaverite-(Cu) | Pb(Fe3+2Cu)(SO4)2(OH)6 |
7.BC.10 | Dorallcharite | TlFe3+3(SO4)2(OH)6 |
7.BC.10 | Huangite | Ca0.5Al3(SO4)2(OH)6 |
7.BC.10 | Hydroniumjarosite | (H3O)Fe3+3(SO4)2(OH)6 |
7.BC.10 | Jarosite | KFe3+3(SO4)2(OH)6 |
7.BC.10 | Natroalunite | NaAl3(SO4)2(OH)6 |
7.BC.10 | Natrojarosite | NaFe3(SO4)2(OH)6 |
7.BC.10 | Osarizawaite | Pb(Al2Cu2+)(SO4)2(OH)6 |
7.BC.10 | Plumbojarosite | Pb0.5Fe3+3(SO4)2(OH)6 |
7.BC.10 | Schlossmacherite | (H3O)Al3(SO4)2(OH)6 |
7.BC.10 | Walthierite | Ba0.5Al3(SO4)2(OH)6 |
7.BC.10 | Beaverite-(Zn) | Pb(Fe3+2Zn)(SO4)2(OH)6 |
7.BC.15 | Ye'elimite | Ca4Al6(SO4)O12 |
7.BC.20 | Atlasovite | K(BiO)Cu6Fe3+(SO4)5O3Cl |
7.BC.20 | Nabokoite | KCu7(SO4)5(Te4+O3)OCl |
7.BC.20 | Puninite | Na2Cu3O(SO4)3 |
7.BC.25 | Chlorothionite | K2Cu(SO4)Cl2 |
7.BC.30 | Euchlorine | KNaCu3(SO4)3O |
7.BC.30 | Fedotovite | K2Cu3(SO4)3O |
7.BC.35 | Kamchatkite | KCu3(SO4)2OCl |
7.BC.40 | Piypite | K4Cu4O2(SO4)4 · (Na,Cu)Cl |
7.BC.45 | Klyuchevskite | K3Cu3(Fe3+,Al)(SO4)4O2 |
7.BC.45 | Alumoklyuchevskite | K3Cu3(Al,Fe3+)(SO4)4O2 |
7.BC.45 | Belousovite | KZn(SO4)Cl |
7.BC.47 | Müllerite | Pb2Fe3+(Te6+O6)Cl |
7.BC.50 | Caledonite | Pb5Cu2(SO4)3(CO3)(OH)6 |
7.BC.50 | Elasmochloite | Na3Cu6BiO4(SO4)5 |
7.BC.52 | Eleomelanite | (K2Pb)Cu4O2(SO4)4 |
7.BC.55 | Wherryite | Pb7Cu2(SO4)4(SiO4)2(OH)2 |
7.BC.55 | Falgarite | K4(VO)3(SO4)5 |
7.BC.57 | Krasheninnikovite | KNa2CaMg(SO4)3F |
7.BC.60 | Mammothite | Pb6Cu4AlSb5+O2(OH)16Cl4(SO4)2 |
7.BC.60 | Wulffite | K3NaCu4O2(SO4)4 |
7.BC.60 | Parawulffite | K5Na3Cu8O4(SO4)8 |
7.BC.62 | Shuvalovite | K2(Ca2Na)(SO4)3F |
7.BC.65 | Linarite | PbCu(SO4)(OH)2 |
7.BC.65 | Schmiederite | Pb2Cu2(Se6+O4)(Se4+O3)(OH)4 |
7.BC.65 | Munakataite | Pb2Cu2(Se4+O3)(SO4)(OH)4 |
7.BC.65 | Therasiaite | (NH4)3KNa2Fe2+Fe3+(SO4)3Cl5 |
7.BC.65 | Saccoite | Ca2Mn3+2F(OH)8 · 0.5(SO4) |
7.BC.70 | Chenite | Pb4Cu(SO4)2(OH)6 |
7.BC.75 | Krivovichevite | Pb3Al(OH)6(SO4)(OH) |
7.BC.80 | Anhydrokainite | KMg(SO4)Cl |
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.
Internet Links for Natroalunite-2c
mindat.org URL:
https://www.mindat.org/min-2715.html
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References for Natroalunite-2c
Localities for Natroalunite-2c
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Bulgaria | |
| Hikov (2004) +1 other reference |
Chile | |
| Deyell et al. (2005) |
| Peter G. Seroka collection |
Costa Rica | |
| Rodríguez et al. (2017) |
Iceland | |
| Mineralogy and bulk geochemistry of a ... |
Japan (FRL) | |
| Amer.Min. (1982) +1 other reference |
| Econ Geol (1989) |
| PXRD by John Attard |
Russia | |
| Okrugin (2004) |
Okumanza Hot Spring, Kusatsu, Agatsuma District, Gunma Prefecture, Japan