Wickmanite Mineral Data

Wickmanite Mineral Data +

General Wickmanite 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

Environment:

Nephelin syenite dike and altered garnet skarn.

IMA Status:

Approved IMA 1967

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for Franz-Erik Wickman (1915-), Swedish mineralogist, who studied the mineralogy of the Langban area.

Synonym:

ICSD 15313

PDF 20-727

Wickmanite Image

Images:

Wickmanite

Comments: Colorless wickmanite crystals.
Location: Langban, Varmland, Sweden. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Wickmanite Crystallography

Cell Dimensions:

a = 7.873, Z = 4; V = 488.00 Den(Calc)= 3.75

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P n3m

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

By Intensity(I/I_o): 3.931(1), 1.762(0.7), 2.778(0.6),

Crystal Structure:

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Basciano L C , Peterson R C , Roeder P L , The Canadian Mineralogist , 36 (1998) p.1203-1210, Description of schoenfliesite, MgSn(OH)6, and roxbyite, Cu1.72S, from a 1375 BC shipwreck,, and rietveld neutron-diffraction refinement of synthetic schoenfliesite, wickmanite,, MnSn(OH)6, and burtite, CaSn(OH)6, Locality: a 1375 BC shipwreck

Physical Properties of Wickmanite

Cleavage:

None

Color:

Yellow, Orange brown, Yellow orange, Colorless.

Density:

3.89

Diaphaniety:

Transparent

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Wickmanite

Gladstone-Dale:

CI meas= 0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.188,KPDmeas= 0.1812,KC= 0.1955

Optical Data:

Isotropic, n=1.705.

Calculated Properties of Wickmanite

Electron Density:

r_electron=3.51 gm/cc
note: r_Wickmanite=3.75 gm/cc.

Fermion Index

Fermion Index = 0.07173
Boson Index = 0.92827

Photoelectric:

PE_Wickmanite= 132.04 barns/electron
U=PE_Wickmanite x r_electron= 463.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wickmanite is Not Radioactive

Wickmanite Classification

Dana Class:

6.3.6.1 (6)Hydroxides and Oxides Containing Hydroxyl

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

(6.3.6)Wickmanite group (Cubic or Trigonal, 2+ cations containing Sn)

6.3.6.1 Wickmanite MnSn(OH)6 P n3m 4/m 3 2/m

6.3.6.2 Schoenfliesite MgSn(OH)6 P n3 2/m 3

6.3.6.3 Natanite FeSn(OH)6 P n3m 4/m 3 2/m

6.3.6.4 Vismirnovite ZnSn(OH)6 P n3m 4/m 3 2/m

6.3.6.5 Burtite CaSn(OH)6 R 3 3

6.3.6.6 Mushistonite (Cu,Zn,Fe)Sn(OH)6 P n3m 4/m 3 2/m

Strunz Class:

IV/F.16-30 IV - Oxides

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

IV/F.16 - Schoenfliesite group

IV/F.16-10 Schoenfliesite MgSn(OH)6 P n3 2/m 3

IV/F.16-20 Burtite CaSn(OH)6 R 3 3

IV/F.16-30 Wickmanite MnSn(OH)6 P n3m 4/m 3 2/m

IV/F.16-40 Natanite FeSn(OH)6 P n3m 4/m 3 2/m

IV/F.16-50 Mushistonite (Cu,Zn,Fe)Sn(OH)6 P n3m 4/m 3 2/m

IV/F.16-60 Vismirnovite ZnSn(OH)6 P n3m 4/m 3 2/m

Other Wickmanite Information

References:

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

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Print or Cut-and-Paste your Wickmanite Specimen Label here :

Wickmanite

Mn++Sn++++(OH)6
Dana No: 6.3.6.1 Strunz No: IV/F.16-30
Locality:

Notes: