Ferroselite Mineral Data

Ferroselite Mineral Data +

General Ferroselite Information

Chemical Formula:

FeSe2

Composition:

Molecular Weight = 213.77 gm

Iron 26.13 % Fe

Selenium 73.87 % Se

______

100.00 %

Empirical Formula:

Fe²⁺Se₂

Environment:

In red-bed deposits of the Colorado Plateau type, peripheral to pyrite and uranium concentrations.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

In the USA, at several localities in Utah, on the Colorado Plateau, including the A.E.C. no. 8 mine, Temple Mountain, Emery Co. Link to MinDat.org Location Data.

Name Origin:

For the composition.

Synonym:

ICSD 25680

PDF 21-432

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Ferroselite Crystallography

Axial Ratios:

a:b:c =0.831:1:0.6206

Cell Dimensions:

a = 4.8001, b = 5.776, c = 3.585, Z = 2; V = 99.40 Den(Calc)= 7.14

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

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

By Intensity(I/I_o): 2.59(1), 2.49(0.85), 1.89(0.8),

Crystal Structure:

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Tengner S , Zeitschrift fur Anorganische und Allgemeine Chemie , 239 (1938) p.126-132, Uber diselenide und ditelluride von eisen, kobalt und nickel

Physical Properties of Ferroselite

Cleavage:

[???] Perfect

Color:

Bronze, Steel gray, Silver white.

Density:

7.21

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Metallic

Streak:

black

Optical Properties of Ferroselite

RL Anisotrophism:

Strong, from gray to lilac-gray.

RL Color:

White with a gray-brown hue.

RL Pleochroism:

Distinct.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ferroselite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	43.80	46.60
420 nm	43.80	46.80
440 nm	43.80	47.00
460 nm	43.90	47.60
480 nm	44.00	48.30
500 nm	44.40	49.20
520 nm	44.90	50.40
540 nm	45.60	51.40
560 nm	46.80	52.50
580 nm	47.30	53.80
600 nm	48.00	54.90
620 nm	48.50	55.80
640 nm	48.90	56.60
660 nm	49.20	57.30
680 nm	49.60	57.70
700 nm	49.90	57.80

**Calculated Relative Intensity Colors of Ferroselite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R₁
R₂

Calculated Properties of Ferroselite

Electron Density:

r_electron=6.28 gm/cc
note: r_Ferroselite=7.14 gm/cc.

Fermion Index

Fermion Index = 0.06168
Boson Index = 0.93832

Photoelectric:

PE_Ferroselite= 67.56 barns/electron
U=PE_Ferroselite x r_electron= 424.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferroselite is Not Radioactive

Ferroselite Classification

Dana Class:

2.12.2.2 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

2.12.2.7 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

2.12.2.8 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

2.12.2.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

2.12.2.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.20-20 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.20 - Markasite - Iridarsenite series

II/D.20-10 Marcasite FeS2 Pnnm 2/m 2/m 2/m

II/D.20-20 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

II/D.20-30 Hastite CoSe2 Pnnm 2/m 2/m 2/m

II/D.20-40 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

II/D.20-50 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

II/D.20-60 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

II/D.20-70 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

II/D.20-80 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

II/D.20-90 Iridarsenite (Ir,Ru)As2 P 2₁/c 2/m

Other Ferroselite Information

References:

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

See Also:

Links to other databases for Ferroselite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Ferroselite

FeSe2
Dana No: 2.12.2.2 Strunz No: II/D.20-20
Locality:

Notes: