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.

Name Pronunciation:

Ferroselite + Pronunciation

Synonym:

Hastite

ICSD 25680

PDF 21-432

Ferroselite Image

Images:

Ferroselite

Comments: Yellowish silver metallic prismatic ferroselite crystals on matrix.
Location: Virgin No. 3 mine, Paradox Valley, Uravan District, Montrose County, Colorado, USA. Scale: See Image.
© Rruff Database

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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drag2 - RMB Resize/Rotate
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H - Help Screen
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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

Diaphaneity:

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:

Bulk Density (Electron Density)=6.28 gm/cc
note: Specific Gravity of Ferroselite =7.14 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Ferroselite= 67.56 barns/electron
U=PE_Ferroselite x rElectron Density= 424.21 barns/cc.

Radioactivity:

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

Ferroselite Classification

Dana Class:

02.12.02.02 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.02)Marcasite Group (Orthorhombic: Pnnm)

02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m

02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

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

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

02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

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

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

02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

02.12.02.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

02.EB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.10a Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.EB.10a Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.EB.10a Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.EB.10a Marcasite FeS2 Pnnm 2/m 2/m 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Ferroselite

FeSe2
Dana No: 02.12.02.02 Strunz No: 02.EB.10a
Locality:

Notes: