Smythite Mineral Data

Smythite Mineral Data +

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General Smythite Information

Chemical Formula:

(Fe,Ni)9S11 or (Fe,Ni)13S16

Composition:

Molecular Weight = 861.75 gm

Iron 43.74 % Fe

Nickel 15.32 % Ni

Sulfur 40.93 % S

______

100.00 %

Empirical Formula:

Fe²⁺_6.75Ni_2.25S₁₁

Environment:

Low temperature oxidation product of the strongly magnetic monoclinic phase of pyrrhotite.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Bloomington quarry, Monroe County, Indiana, USA Link to MinDat.org Location Data.

Name Origin:

Named for Charles Henry Smyth (1866-1937), economic geologist and petrologist of Princeton University, New Jersey, USA.

Synonym:

ICSD 42537

PDF 10-437

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Smythite Crystallography

Axial Ratios:

a:c = 1:9.94236

Cell Dimensions:

a = 3.47, c = 34.5, Z = 1; V = 359.76 Den(Calc)= 3.98

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 11.5(1), 2.994(0.31), 2.566(0.25),

Crystal Structure:

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Erd R C , Evans H T , Richter D H , American Mineralogist , 42 (1957) p.309-333, Smythite, a new iron sulfide, and associated pyrrhotite from Indiana

Physical Properties of Smythite

Cleavage:

[0001] Perfect

Color:

Brownish black, Light bronze.

Density:

4.32

Diaphaniety:

Opaque

Fracture:

Flexible - Flexible fragments.

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Thin - Flat dimensioned crystals.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Metallic

Magnetism:

Ferromagnetic

Streak:

dark gray

Optical Properties of Smythite

RL Anisotrophism:

Strong, in yellow and blue-gray.

RL Color:

Pinkish cream.

RL Pleochroism:

Strong, from grayish yellow to reddish brown.

Calculated Properties of Smythite

Electron Density:

r_electron=3.83 gm/cc
note: r_Smythite=3.98 gm/cc.

Fermion Index

Fermion Index = 0.01407
Boson Index = 0.98593

Photoelectric:

PE_Smythite= 21.59 barns/electron
U=PE_Smythite x r_electron= 82.68 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Smythite is Not Radioactive

Smythite Classification

Dana Class:

2.8.10.2 (2)Sulfides - Including Selenides and Tellurides

(2.8)where Am Bn Xp, with (m+n):p=1:1

(2.8.10)Dana Group

2.8.10.1 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m

2.8.10.2 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m

Strunz Class:

II/C.19-50 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.19 - Troilite - Pyrrhotite - Haideite series

II/C.19-10 Troilite FeS P 6₃/mmc 6/m 2/m 2/m

II/C.19-20 Pyrrhotite Fe(1-x)S(x=0-0.17) A2/a 2/m

II/C.19-25 Jaipurite* CoS P 6₃/mmc 6/m 2/m 2/m

II/C.19-30 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m

II/C.19-40 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m

II/C.19-50 Smythite (Fe,Ni)9S11or(Fe,Ni)13S16 R 3m 3 2/m

II/C.19-60 Achavalite* FeSe P 6₃/mmc 6/m 2/m 2/m

II/C.19-70 Heideite (Fe,Cr)1x(Ti,Fe)2S4 I2/m 2/m

Other Smythite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Smythite

(Fe,Ni)9S11 or (Fe,Ni)13S16
Dana No: 2.8.10.2 Strunz No: II/C.19-50
Locality:

Notes: