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.

Name Pronunciation:

Lenaite

Synonym:

ICSD 56263

IMA1994-008

PDF 48-1895

Lenaite Image

Images:

Lenaite

Comments: PPL polished section showing eutectic intergrowth of violet-brown lenaite with bluish-grey stephanite and freibergite (grey with a slight brownish tint).
Location: Privolnoye deposit, Central Yakutia, Russia. Scale: Picture Size 0.14 mm.
© Thomas Witzke

Lenaite Crystallography

Axial Ratios:

a:c = 1:1.99516

Cell Dimensions:

a = 5.4371, c = 10.8479, Z = 4; V = 320.69 Den(Calc)= 4.72

Crystal System:

Tetragonal - Ditetragonal PyramidalH-M Symbol (4mm) Space Group: P 4₂mc

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

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

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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:

4-4.5 - Between Fluorite and Apatite

Luster:

Metallic

Streak:

dark gray

Optical Properties of Lenaite

RL Anisotrophism:

Moderate in yellowish tints.

RL Bireflectance:

None.

RL Color:

Grayish white.

RL Pleochroism:

None.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Lenaite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	30.90	30.60
546 nm	32.80	35.80
589 nm	31.80	36.50
650 nm	28.20	35.00

**Calculated Relative Intensity Colors of Lenaite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	290%
R₁
R₂

Calculated Properties of Lenaite

Electron Density:

Bulk Density (Electron Density)=4.35 gm/cc
note: Specific Gravity of Lenaite =4.72 gm/cc.

Fermion Index:

Fermion Index = 0.0073072937
Boson Index = 0.9926927063

Photoelectric:

PE_Lenaite= 126.39 barns/electron
U=PE_Lenaite x rElectron Density= 549.83 barns/cc.

Radioactivity:

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

Lenaite Classification

Dana Class:

02.09.01.05 (02)Sulfides - Including Selenides and Tellurides

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

(02.09.01)Chalcopyrite Group (Tetragonal: I-42d)

02.09.01.01 Chalcopyrite CuFeS2 I 42d 4 2m

02.09.01.02 Eskebornite CuFeSe2 I 42d 4 2m

02.09.01.03 Gallite CuGaS2 I 42d 4 2m

02.09.01.04 Roquesite CuInS2 I 42d 4 2m

02.09.01.05 Lenaite AgFeS2 P 4₂mc 4mm

02.09.01.06 Laforetite! AgInS2 I 42d 4 2m

Strunz Class:

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

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CB -With Zn, Fe, Cu, Ag, Au, etc

02.CB.10a Chalcopyrite CuFeS2 I 42d 4 2m

02.CB.10a Eskebornite CuFeSe2 I 42d 4 2m

02.CB.10a Gallite CuGaS2 I 42d 4 2m

02.CB.10a Laforetite! AgInS2 I 42d 4 2m

02.CB.10a Lenaite AgFeS2 P 4₂mc 4mm

02.CB.10a Roquesite CuInS2 I 42d 4 2m

Other Lenaite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,V81:1283 and v91:1953) OPTIC PROP.(AmMin, 91:1953)

See Also:

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

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Ask about Lenaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Lenaite

AgFeS2
Dana No: 02.09.01.05 Strunz No: 02.CB.10a
Locality:

Notes: