Tetrawickmanite Mineral Data

Tetrawickmanite Mineral Data +

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General Tetrawickmanite Information

Chemical Formula:

Mn++Sn++++(OH)6

Composition:

Molecular Weight = 275.69 gm

Manganese 19.93 % Mn 25.73 % MnO

Tin 43.06 % Sn 54.67 % SnO₂

Hydrogen 2.19 % H 19.60 % H₂O

Oxygen 34.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Sn(OH)₆

IMA Status:

Approved IMA 1973

Locality:

Foote Quarry, Kings Mountain, Cleveland County, North Carolina, USA. Link to MinDat.org Location Data.

Name Origin:

Named as the tetragonal analog of wickmanite.

Tetrawickmanite Image

Images:

Tetrawickmanite

Comments: Tan, pseudoctahedral crystal of tetrawickmanite on matrix.
Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tetrawickmanite Crystallography

Axial Ratios:

a:c = 1:1.00128

Cell Dimensions:

a = 7.787, c = 7.797, Z = 4; V = 472.79 Den(Calc)= 3.87

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4₁/n

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

By Intensity(I/I_o): 3.94(1), 2.77(0.9), 1.76(0.5),

Physical Properties of Tetrawickmanite

Cleavage:

None

Color:

Brown orange, Honey yellow.

Density:

3.65

Diaphaniety:

Transparent to Translucent

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

3.5-4.5 - Between Copper Penny and Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tetrawickmanite

Gladstone-Dale:

CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1866,KPDmeas= 0.1978,KC= 0.1955

Optical Data:

Uniaxial (-), e=1.72, w=1.724, bire=0.0040.

Calculated Properties of Tetrawickmanite

Electron Density:

r_electron=3.42 gm/cc
note: r_{Tetrawickmanite}=3.65 gm/cc.

Fermion Index

Fermion Index = 0.07173
Boson Index = 0.92827

Photoelectric:

PE_{Tetrawickmanite}= 132.04 barns/electron
U=PE_{Tetrawickmanite} x r_electron= 451.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tetrawickmanite is Not Radioactive

Tetrawickmanite Classification

Dana Class:

6.3.7.2 (6)Hydroxides and Oxides Containing Hydroxyl

(6.3)with (OH)3 or (OH)6 groups

(6.3.7)Wickmanite group (Tetragonal: P42/n)

6.3.7.1 Stottite FeGe(OH)6 P 4₁/n 4/m

6.3.7.2 Tetrawickmanite MnSn(OH)6 P 4₁/n 4/m

6.3.7.3 Jeanbandyite (Fe,Mn)Sn(OH)6 P 4₁/n 4/m

6.3.7.4 Mopungite NaSb(OH)6 P 4₁/n 4/m

Strunz Class:

IV/F.17-20 IV - Oxides

IV/F - Hydroxides and oxidic hydrates, water-bearing oxides with layered structure

IV/F.17 - Stottite group, Mopungite - Stottite series

IV/F.17-10 Mopungite NaSb(OH)6 P 4₁/n 4/m

IV/F.17-20 Tetrawickmanite MnSn(OH)6 P 4₁/n 4/m

IV/F.17-30 Jeanbandyite (Fe,Mn)Sn(OH)6 P 4₁/n 4/m

IV/F.17-40 Stottite FeGe(OH)6 P 4₁/n 4/m

IV/F.17-50 Eyselite! FeGe3O7(OH) P*** Ortho

Other Tetrawickmanite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Tetrawickmanite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Tetrawickmanite

Mn++Sn++++(OH)6
Dana No: 6.3.7.2 Strunz No: IV/F.17-20
Locality:

Notes: