Voltaite Mineral Data + Say VOLTAITE

General Voltaite Information

Help on Chemical  Formula: Chemical Formula: K2Fe++5Fe+++3Al(SO4)12·18(H2O)
Help on Composition: Composition: Molecular Weight = 2,028.99 gm
   Potassium   3.85 %  K     4.64 % K2O
   Aluminum    1.33 %  Al    2.51 % Al2O3
   Iron       22.02 %  Fe   17.70 % FeO / 11.81 % Fe2O3
   Hydrogen    1.79 %  H    15.98 % H2O
   Sulfur     18.96 %  S    47.35 % SO3
   Oxygen     52.04 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Fe2+5Fe3+3Al(SO4)12·18(H2O)
Help on Environment: Environment: Solfatara and fumaroles associated with volcanic activity and continental evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1841
Help on Locality: Locality: Pozzuoli near Naples, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Italian physicist, Alessandro G. A. A. Volta (1745-1841).
Help on Synonym: Synonym: ICSD 9254
  Monsmedite
  PDF 20-1388
 

Voltaite Image

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Voltaite   Alunogen

Comments: Dark greenish-black crystals of voltaite on white alunogen.
Location: Carola Mine, Freital, Dresden, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

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Voltaite   Szomolnokite

Comments: Whitish crystalline crust of voltaite on crystals of brown szomolnokite.
Location: Alcaparrosa Mine, Cerritos Bayos, Chile. Scale: Picture size 1 cm.
© John Veevaert

Voltaite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 27.178, Z = 16; V = 20,074.86 Den(Calc)= 2.69
Help on Crystal System: Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.54(1), 3.41(0.9), 5.57(0.7),
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Mereiter K , Tschermaks Mineralogische und Petrographische Mitteilungen , 18 (1972) p.185-202, Die kristallstruktur des voltaits, K2Fe2+5Fe3+3Al[SO4]12*18H2O

 

Physical Properties of Voltaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Greenish black, Dark green, Olive green, Black.
Help on Density: Density: 2.6 - 2.8, Average = 2.7
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Silky
Help on Streak: Streak: grayish green
 

Optical Properties of Voltaite

Help on Optical Data: Optical Data: Isotropic, n=1.593-1.608.
 

Calculated Properties of Voltaite

Help on Electron Density: Electron Density:

relectron=2.69 gm/cc
note: rVoltaite =2.69 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00634
Boson Index = 0.99366
Help on Photoelectric: Photoelectric:

PEVoltaite = 8.02 barns/electron
U=PEVoltaite x relectron= 21.59 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 55.65 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Voltaite - barely detectable

 

Voltaite Classification

Help on  Dana Class: Dana Class: 29.9.1.1 (29)Hydrated Acid and Sulfates
  (29.9)with miscellaneous formulae
  (29.9.1)Dana Group
 
29.9.1.1 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m
 
29.9.1.2 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m
Help on  Strunz Class: Strunz Class: VI/C.14-50 VI - Sulfates,Chromates,Molybdates and Tungstates
  VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size
  VI/C.14 - Sodium alum - Zincovoltaite series
 
VI/C.14-10 Sodium-alum NaAl(SO4)2·12(H2O) P a3 2/m 3
 
VI/C.14-20 Potassium-alum KAl(SO4)2·12(H2O) P a3 2/m 3
 
VI/C.14-30 Tschermigite (NH4)Al(SO4)2·12(H2O) P a3 2/m 3
 
VI/C.14-40 Lonecreekite (NH4)(Fe,Al)(SO4)2·12(H2O) P a3 2/m 3
 
VI/C.14-45 Lanmuchangite! TlAl(SO4)2·12(H2O) P a3 2/m 3
 
VI/C.14-50 Voltaite K2Fe5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m
 
VI/C.14-60 Zincovoltaite K2Zn5Fe3Al(SO4)12·18(H2O) F d3c 4/m 3 2/m
 

Other Voltaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Voltaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Voltaite

K2Fe++5Fe+++3Al(SO4)12·18(H2O)
Dana No: 29.9.1.1 Strunz No: VI/C.14-50
Locality:

 

Notes:

 

 
   
 
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