Metavoltine Mineral Data

Metavoltine Mineral Data +

General Metavoltine Information

Chemical Formula:

K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O)

Composition:

Molecular Weight = 2,189.12 gm

Potassium 7.14 % K 8.61 % K₂O

Sodium 4.20 % Na 5.66 % Na₂O

Zinc 1.49 % Zn 1.86 % ZnO

Iron 16.58 % Fe 1.64 % FeO / 21.88 % Fe₂O₃

Hydrogen 1.84 % H 16.46 % H₂O

Sulfur 17.58 % S 43.89 % SO₃

Oxygen 51.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₄Na₄Fe²⁺_0.5Zn_0.5Fe³⁺₆(SO₄)₁₂O₂·20(H₂O)

Environment:

Volcanic exhalations.

IMA Status:

Valid Species (Pre-IMA) 1883

Locality:

From Vesuvius and Cape Miseno, near Naples, Italy. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "with" and voltine, because is was found associated with voltaite at the original locality.

Synonym:

ICSD 8270

PDF 29-1043

Metavoltine Image

Images:

Metavoltine Alunogen

Comments: Yellow metavoltine with white alunogen.
Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Metavoltine Crystallography

Axial Ratios:

a:c = 1:1.89523

Cell Dimensions:

a = 9.545, c = 18.09, Z = 1; V = 1,427.32 Den(Calc)= 2.55

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.08(1), 18.2(0.8), 2.018(0.4),

Physical Properties of Metavoltine

Cleavage:

[0001] Perfect

Color:

Greenish brown, Yellow brown, Orange brown, Lemon.

Density:

2.5

Diaphaniety:

Transparent to translucent

Habit:

Scaly - Morphology like fish scales.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent.

Luster:

Resinous

Streak:

brownish yellow

Optical Properties of Metavoltine

Dichroism (e):

light yellow or pale greenish yellow.

Dichroism (w):

dark yellowish brown or dark yellowish brown.

Gladstone-Dale:

CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2291,KPDmeas= 0.2337,KC= 0.2331

Optical Data:

Uniaxial (-), e=1.573-1.581, w=1.588-1.595, bire=0.0140-0.0150.

Calculated Properties of Metavoltine

Electron Density:

r_electron=2.50 gm/cc
note: r_Metavoltine=2.50 gm/cc.

Fermion Index

Fermion Index = 0.0057
Boson Index = 0.9943

Photoelectric:

PE_Metavoltine= 7.42 barns/electron
U=PE_Metavoltine x r_electron= 18.58 barns/cc.

Radioactivity:

GRapi = 103.23 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Metavoltine - barely detectable

Metavoltine Classification

Dana Class:

29.4.6.1 (29)Hydrated Acid and Sulfates

(29.4)where (A+)2 Bn (XO4)p · x(H2O)

(29.4.6)Dana Group

29.4.6.1 Metavoltine K4Na4(Fe,Zn)Fe6(SO4)12O2·20(H2O) P 3 3

Strunz Class:

VI/D.14-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.14 - Metavoltine - Slavikite series

VI/D.14-10 Metavoltine K4Na4(Fe,Zn)Fe6(SO4)12O2·20(H2O) P 3 3

VI/D.14-20 Motukoreaite Na2Mg38Al24(CO3)13(SO4)8(OH)108·56(H2O) R 3m 3 2/m

VI/D.14-22 Nikischerite! NaFe6Al3(SO4)2(OH)18(H2O)12 R 3 3

VI/D.14-23 Shigaite Mn7Al4(SO4)2(OH)22·8(H2O) R 3 3

VI/D.14-25 Wermlandite (Ca,Mg)Mg7(Al,Fe)2(SO4)2(OH)18·12(H2O) P 3c1 3 2/m

VI/D.14-30 Lannonite HCa4Mg2Al4(SO4)8F9·32(H2O) Unk Tetra

VI/D.14-40 Slavikite NaMg2Fe5(SO4)7(OH)6·33(H2O) R 3 3

Other Metavoltine Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Metavoltine

K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O)
Dana No: 29.4.6.1 Strunz No: VI/D.14-10
Locality:

Notes: