Lenaite Mineral Data

Lenaite Mineral Data +

General Lenaite Information

Chemical Formula:

AgFeS2

Composition:

Molecular Weight = 227.85 gm

Iron 24.51 % Fe

Silver 47.34 % Ag

Sulfur 28.15 % S

______

100.00 %

Empirical Formula:

AgFe³⁺S₂

Environment:

In goethite pseudomorphs after magnesian siderite.

IMA Status:

Approved IMA 1995

Locality:

Silver-lead deposit in the Verkhoyano-Kolymskaya fold system, of the Lena River basin, Eastern Yakutia, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the Lena River.

Synonym:

ICSD 56263

IMA1994-008

PDF 48-1895

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Lenaite Crystallography

Axial Ratios:

a:c = 1:1.83333

Cell Dimensions:

a = 5.64, c = 10.34, Z = 4; V = 328.91 Den(Calc)= 4.60

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42d

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

By Intensity(I/I_o): 3.15(1), 1.91(0.4), 2.445(0.2),

Crystal Structure:

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Bindi L , Spry P G , Pratesi G , The Canadian Mineralogist , 44 (2006) p.207-212, Lenaite from the Gies gold-silver telluride deposit, Judith Mountains, Montana, USA:, occurrence, composition, and crystal structure, Locality: Gies gold-silver telluride deposit, Judith Mountains, Montana, USA

Physical Properties of Lenaite

Cleavage:

None

Color:

Gray.

Density:

4.57

Diaphaniety:

Opaque

Fracture:

Unknown - Minerals too small to observe fractures.

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Metallic

Streak:

dark gray

Calculated Properties of Lenaite

Electron Density:

r_electron=4.24 gm/cc
note: r_Lenaite=4.60 gm/cc.

Fermion Index

Fermion Index = 0.0073
Boson Index = 0.9927

Photoelectric:

PE_Lenaite= 126.39 barns/electron
U=PE_Lenaite x r_electron= 535.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lenaite is Not Radioactive

Lenaite Classification

Dana Class:

2.9.1.5 (2)Sulfides - Including Selenides and Tellurides

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

(2.9.1)Chalcopyrite Group (Tetragonal: I4¯2d)

2.9.1.1 Chalcopyrite CuFeS2 I 42d 4 2m

2.9.1.2 Eskebornite CuFeSe2 I 42d 4 2m

2.9.1.3 Gallite CuGaS2 I 42d 4 2m

2.9.1.4 Roquesite CuInS2 I 42d 4 2m

2.9.1.5 Lenaite AgFeS2 I 42d 4 2m

2.9.1.6 Laforetite! AgInS2 I 42d 4 2m

Strunz Class:

II/C.03-25 II - Sulfides and sulphosalts

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

II/C.03 - Chalcopyrite group and related compounds

II/C.03-10 Chalcopyrite CuFeS2 I 42d 4 2m

II/C.03-20 Eskebornite CuFeSe2 I 42d 4 2m

II/C.03-25 Lenaite AgFeS2 I 42d 4 2m

II/C.03-30 Gallite CuGaS2 I 42d 4 2m

II/C.03-40 Roquesite CuInS2 I 42d 4 2m

II/C.03-50 Laforetite! AgInS2 I 42d 4 2m

Other Lenaite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1283.199-)

See Also:

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

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Lenaite

AgFeS2
Dana No: 2.9.1.5 Strunz No: II/C.03-25
Locality:

Notes: