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Ammoniovoltaite

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Formula:
(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18
Colour:
Black
Lustre:
Vitreous
Hardness:
Crystal System:
Isometric
Member of:
Name:
Named for being the ammonium analogue of voltaite.
Structure determined. Forms at ~ 100 °C around geothermal gas-steam vents.

The NH4 analogue of voltaite.


Hide all sections | Show all sections

Classification of AmmoniovoltaiteHide

Approved
Approval Year:
2017
First Published:
2018
7.CC.

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

Physical Properties of AmmoniovoltaiteHide

Vitreous
Transparency:
Opaque
Colour:
Black
Comment:
greenish grey colour in thin fragments
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None
Fracture:
Conchoidal

Optical Data of AmmoniovoltaiteHide

Type:
Isotropic
RI values:
n = 1.602(2)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemical Properties of AmmoniovoltaiteHide

Formula:
(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18

Crystallography of AmmoniovoltaiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3c
Setting:
Fd3c
Cell Parameters:
a = 27.322(1) Å
Unit Cell V:
20396 ų
Z:
16
Comment:
a = 27.250 at 100 K.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.67Å(74)
7.90Å(56)
5.58Å(84)
3.560Å(100)
3.418Å(100)
3.057Å(28)
2.866Å(37)
2.091Å(33)
Comments:
From Type Description.

Occurrences of AmmoniovoltaiteHide

Paragenetic Mode(s):
•  Fumarolic

Type Occurrence of AmmoniovoltaiteHide

General Appearance of Type Material:
Euhedral crystals to 50 µm on alunogen
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky prospect 18 korp 2, Moscow 119071, Russia, catalogue number 5030/1
Empirical Formula of Type Material:
[(NH4)1.88K0.08Ca0.04]Σ2.00(Fe2+3.74Mg1.17Fe3+0.05Zn0.01)Σ4.97(Fe3+2.89Al0.09)Σ2.98Al1.00(SO4)12.00(H2O)18.00
Chemical Analysis of Type Material:
FeO13.26 %
Fe2O311.58 %
MgO2.33 %
ZnO0.04 %
Al2O32.74 %
SO347.46 %
K2O0.19 %
CaO0.11 %
(NH4)2O2.96 %
H2O16.03 %
Total:96.7 %
Geological Setting of Type Material:
Geothermal gas/steam vents
Associated Minerals at Type Locality:
Reference:
Zhitova, E.S., Siidra, O.I., Belakovsky, D.I., Shilovskikh, V.V., Nuzhdaev, A.A., Ismagilova, R.M. (2018) Ammoniovoltaite, (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18, a new mineral from the Severo-Kambalny geothermal field, Kamchatka, Russia. Mineralogical Magazine: 82: 1057-1077.

Synonyms of AmmoniovoltaiteHide

Relationship of Ammoniovoltaite to other SpeciesHide

Member of:
Other Members of this group:
Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
MagnesiovoltaiteK2Mg5Fe3+3Al(SO4)12·18H2OIso. m3m (4/m 3 2/m) : Fd3c
PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c

Related Minerals - Nickel-Strunz GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
7.CC.AndychristyitePbCu2+Te6+O5(H2O)Tric. 1 : P1
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Other InformationHide

Notes:
Soluble in water.
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 AmmoniovoltaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zhitova, E.S., Siidra, O.I., Shilovskikh, V.V., Belakovsky, D.I., Nuzhdaev, A.A. and Ismagilova, R.M. (2017) Ammoniovoltaite, IMA 2017-022. CNMNC Newsletter No. 38, August 2017, page 1035. Mineralogical Magazine: 81: 1033–1038.
Zhitova, E.S., Siidra, O.I., Belakovsky, D.I., Shilovskikh, V.V., Nuzhdaev, A.A., Ismagilova, R.M. (2018) Ammoniovoltaite, (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18, a new mineral from the Severo-Kambalny geothermal field, Kamchatka, Russia. Mineralogical Magazine: 82: 1057-1077.

Internet Links for AmmoniovoltaiteHide

Localities for AmmoniovoltaiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Russia (TL)
 
  • Kamchatka Krai
    • Kambalny volcanic ridge
Zhitova, E.S., Siidra, O.I., Shilovskikh, V.V., Belakovsky, D.I., Nuzhdaev, A.A. and Ismagilova, R.M. (2017) Ammoniovoltaite, IMA 2017-022. CNMNC Newsletter No. 38, August 2017, page 1035; Mineralogical Magazine: 81: 1033–1038.; Zhitova, E.S., Siidra, O.I., Belakovsky, D.I., Shilovskikh, V.V., Nuzhdaev, A.A., Ismagilova, R.M. (2018) Ammoniovoltaite, (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18, a new mineral from the Severo-Kambalny geothermal field, Kamchatka, Russia. Mineralogical Magazine: 82: 1057-1077.
 
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