Ferdisilicite Mineral Data

General Ferdisilicite Information

Chemical Formula:

FeSi2

Composition:

Molecular Weight = 112.02 gm

Iron 49.86 % Fe

Silicon 50.14 % Si

______

100.00 %

Empirical Formula:

Fe⁰⁺Si₂

Environment:

Found in heavy mineral concentrates from placers and in drill-core samples of sandstones of the Poltava series.

IMA Status:

Not Approved IMA - Published without Approval 1969

Locality:

Zachativsk station, Donets region, Russia. Link to MinDat.org Location Data.

Name Origin:

Name for the chemical composition (Ferrous and two (di) Silicide).

Name Pronunciation:

Ferdisilicite + Pronunciation

Synonym:

ICSD 42562

PDF 35-822

Ferdisilicite Image

Images:

Ferdisilicite Fersilicite

Comments: Dark grains of ferdisilicite, in sand, intermixed with dark grains of fersilicate.
Location: Poltava series, Zachativsk station, Donets (Donetsk) region, Donets'k Oblast' (Donetsk Oblast'), Ukraine. Scale: 0.2 cm field of view.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferdisilicite Crystallography

Axial Ratios:

a:c = 1:1.88847

Cell Dimensions:

a = 2.69, c = 5.08, Z = 1; V = 36.76 Den(Calc)= 5.06

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm

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

By Intensity(I/I_o): 1.089(1), 1.846(1), 2.371(0.9),

Physical Properties of Ferdisilicite

Cleavage:

None

Color:

Steel gray.

Density:

5.05

Diaphaneity:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

6.5 - Pyrite

Luster:

Metallic

Streak:

black

Calculated Properties of Ferdisilicite

Electron Density:

Bulk Density (Electron Density)=4.88 gm/cc
note: Specific Gravity of Ferdisilicite =5.06 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Ferdisilicite}= 16.68 barns/electron
U=PE_{Ferdisilicite} x rElectron Density= 81.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ferdisilicite is Not Radioactive

Ferdisilicite Classification

Dana Class:

02.00.00.00 (02)Sulfide Minerals

(02.00)Without Dana Classification Numbers

(02.00.00)Silicide

02.00.00.00 Argentite* Ag2S I m3m 4/m 3 2/m

02.00.00.00 Bayankhanite? Cu6HgS4 Unk Hex

02.00.00.00 Bismutoplagionite* 5PbS.4Bi2S3 Unk Ortho

02.00.00.00 Bravoite? (Fe,Ni,Co)S2 P a3 2/m 3

02.00.00.00 Colimaite K3VS4 P nma 2/m 2/m 2/m

02.00.00.00 Dayingite* CuCoPtS4 F m3m 4/m 3 2/m

02.00.00.00 Dilithium* Li2Te P 222 2 2 2

02.00.00.00 Dzhezkazganite* (Pb,Cu,Rh)S2(?) P a3? 2/m 3

02.00.00.00 Ferdisilicite* FeSi2 P 4/mmm 4/m 2/m 2/m

02.00.00.00 Fersilicite* FeSi P 2₁3 2 3

02.00.00.00 Horobetsuite* (Bi,Sb)2S3 Pbnm 2/m 2/m 2/m

02.00.00.00 Horomanite Fe6Ni3S8 P 4/mmm 4mm

02.00.00.00 Imgreite? NiTe P 6₃/mmc 6/m 2/m 2/m

02.00.00.00 Iridisite* (Ir,Cu,Rh,Ni,Pt)S2 Unk Cubic

02.00.00.00 Isochalcopyrite? Cu8Fe9S16 Unk Cubic

02.00.00.00 Jaipurite* CoS P 6₃/mmc 6/m 2/m 2/m

02.00.00.00 Kitaibelite? Ag10PbBi30S51 Mono ? Mono

02.00.00.00 Kurilite? (Ag,Au)2(Te,Se,S) P m3n,P 4₃n Cubic

02.00.00.00 Plumosite* Pb2Sb2S5 Mono

02.00.00.00 Protojoseite* Bi4TeS2(?) R 3m 3 2/m

02.00.00.00 Samaniite Cu2Fe5Ni2S8 P 4₁/mmm 4mm

02.00.00.00 Stibioenargite* Cu3(Sb,As)S4 Unk Ortho

02.00.00.00 Sztrokayite* Bi3TeS2 Trig ? Trig

02.00.00.00 Volfsonite* Cu10CuFeFe2Sn3S16 P 4₂m-,P 42₁2 Tetra

Strunz Class:

01.BB.20 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.B - Metallic Carbides, Silicides, Nitrides and Phosphides

01.BB -Silicides

01.BB.20 Ferdisilicite* FeSi2 P 4/mmm 4/m 2/m 2/m

Other Ferdisilicite Information

References:

NAME( AmMin, v54:1737) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ferdisilicite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ferdisilicite

FeSi2
Dana No: 02.00.00.00 Strunz No: 01.BB.20
Locality:

Notes:

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