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Magnesiovoltaite

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About MagnesiovoltaiteHide

Formula:
K2Mg5Fe3+3Al(SO4)12·18H2O
Colour:
Yellow, brownish-yellow, pale yellowish-green
Hardness:
Specific Gravity:
2.51
Crystal System:
Isometric
Member of:
Name:
For the mineral voltaite and its magnesium content.
The Mg analogue of voltaite. Also the K analogue of ammoniomagnesiovoltaite. Chemically related to pertlikite.




Classification of MagnesiovoltaiteHide

Approved, Pending publication
Approval Year:
2016

Physical Properties of MagnesiovoltaiteHide

Colour:
Yellow, brownish-yellow, pale yellowish-green
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Density:
2.51(2) g/cm3 (Measured)    2.506 g/cm3 (Calculated)

Optical Data of MagnesiovoltaiteHide

Type:
Isotropic
RI values:
nα = 1.584(2) nβ = 1.587(2) nγ = 1.588(2) nω = 1.588(2) nε = 1.584(2)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate
Comments:
anomalously anisotropic, uniaxial ( ε = 1.584(2) and ω = 1.588(2),) or biaxial (-) (α, β and γ applied)

Chemical Properties of MagnesiovoltaiteHide

Formula:
K2Mg5Fe3+3Al(SO4)12·18H2O
IMA Formula:
K2Mg5Fe3+3Al(SO4)12 · 18H2O
Common Impurities:
Mn,Zn,(Na)

Crystallography of MagnesiovoltaiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3c
Setting:
Fd3c
Cell Parameters:
a = 27.161(1) Å
Unit Cell V:
20037.2 ų
Z:
16
Morphology:
main forms: {111}, {100}; subordinate forms: {110}, {211}
Comment:
isostructural with other group members

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.56Å(29)
6.77Å(37)
5.53Å(61)
3.532Å(68)
3.392Å(100)
3.034Å(45)
2.845Å(30)
2.531Å(24)

Type Occurrence of MagnesiovoltaiteHide

General Appearance of Type Material:
isometric crystals, up to 2 mm
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration numbers 4780/1 (holotype) and 4780/2 (cotype)
Geological Setting of Type Material:
oxidation of pyritic masses under increasingly arid conditions.
Associated Minerals at Type Locality:

Synonyms of MagnesiovoltaiteHide

Relationship of Magnesiovoltaite 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
Ammoniovoltaite(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18Iso. 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

Common AssociatesHide

Alum-(K)KAl(SO4)2 · 12H2O
BotryogenMgFe3+(SO4)2(OH) · 7H2O
JarositeKFe3+3(SO4)2(OH)6
MagnesiocopiapiteMgFe3+4(SO4)6(OH)2 · 20H2O
OpalSiO2 · nH2O
PickeringiteMgAl2(SO4)4 · 22H2O
TamarugiteNaAl(SO4)2 · 6H2O

Other InformationHide

IR Spectrum:
spectrum is given
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 MagnesiovoltaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Möhn, G., Rusakov, V.S., Pekov, I.V., Scholz, R., Eremina, T.A., Belakovskiy, D.I., and Lorenz, J.A., 2016. Magnesiovoltaite, IMA 2015-095. CNMNC Newsletter No. 29, February 2016, 203; Mineralogical Magazine: 80: 199–205.
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Möhn, G., Rusakov, V.S., Pelov, I.V., Scholz, R., Eremina, T.A., Belakovskiy, D.I., Lorenz, J.A. (2016): Magnesiovoltaite, K2Mg5Fe3+3Al(SO4)12·18H2O, a new mineral from the Alcaparrosa mine, Antofagasta region, Chile. European Journal of Mineralogy 28, 1005-1017.

Internet Links for MagnesiovoltaiteHide

Localities for MagnesiovoltaiteHide

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.
Chile (TL)
 
  • Antofagasta
    • El Loa Province
      • Calama
        • Cerritos Bayos
Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Möhn, G., Rusakov, V.S., Pekov, I.V., Scholz, R., Eremina, T.A., Belakovskiy, D.I., and Lorenz, J.A., 2016. Magnesiovoltaite, IMA 2015-095. CNMNC Newsletter No. 29, February 2016, 203; Mineralogical Magazine 80, 199–205; Chukanov, N.V., Aksenov, S.M., Rastsvetaeva, R.K., Möhn, G., Rusakov, V.S., Pelov, I.V., Scholz, R., Eremina, T.A., Belakovskiy, D.I., Lorenz, J.A. (2016): Magnesiovoltaite, K2Mg5Fe3+3Al(SO4)12·18H2O, a new mineral from the Alcaparrosa mine, Antofagasta region, Chile. European Journal of Mineralogy 28, 1005-1017.
Italy
 
  • Campania
    • Naples
      • Pozzuoli
- Russo, M., Campostrini, I., Demartin, F. (2017): I minerali di origine fumarolica dei Campi Flegrei: Solfatara di Pozzuoli (Napoli) e dintorni. Micro, 15, 122-192.
- Russo, M., Campostrini, I., Demartin, F. (2017): I minerali di origine fumarolica dei Campi Flegrei: Solfatara di Pozzuoli (Napoli) e dintorni. Micro, 15, 122-192.
  • Tuscany
    • Lucca Province
      • Vergemoli
        • Fornovolasco
Mauro D. (2016): Studio cristallochimico di alcuni solfati di ferro della mineralizzazione a pirite tallifera di Fornovolasco (Alpi Apuane). Tesi magistrale, Dipartimento di Scienze della Terra, Unviersità di Pisa, 137 pp. (EDS identification].
 
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