Buckhornite Mineral Data

General Buckhornite Information

Chemical Formula:

AuPb2BiTe2S3

Composition:

Molecular Weight = 1,171.74 gm

Bismuth 17.83 % Bi

Tellurium 21.78 % Te

Lead 35.37 % Pb

Gold 16.81 % Au

Sulfur 8.21 % S

______

100.00 %

Empirical Formula:

AuPb₂BiTe₂S₃

IMA Status:

Approved IMA 1992

Locality:

Buckhorn mine, near Jamestown, Boulder, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Name Pronunciation:

Buckhornite + Pronunciation

Synonym:

IMA1988-022

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Buckhornite Crystallography

Axial Ratios:

a:b:c =0.3337:1:0.7581

Cell Dimensions:

a = 4.108, b = 12.308, c = 9.331, Z = 2; V = 471.79 Den(Calc)= 8.25

Crystal System:

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

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

By Intensity(I/I_o): 2.39(1), 2.763(1), 3.739(0.8),

Crystal Structure:

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Effenberger H , Culetto F J , Topa D , Paar W H , Zeitschrift fur Kristallographie , 215 (2000) p.10-16, The crystal structure of synthetic buckhornite, [Pb2BiS3][AuTe2], Locality: synthetic

Physical Properties of Buckhornite

Cleavage:

{???} Perfect

Color:

Black.

Diaphaneity:

Opaque

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

2.5 - Finger Nail

Luster:

Metallic

Streak:

gray

Calculated Properties of Buckhornite

Electron Density:

Bulk Density (Electron Density)=6.73 gm/cc
note: Specific Gravity of Buckhornite =8.25 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Buckhornite=1,379.89 barns/electron
U=PE_Buckhornite x rElectron Density=9,288.00 barns/cc.

Radioactivity:

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

Buckhornite Classification

Dana Class:

02.11.11.01 (02)Sulfides - Including Selenides and Tellurides

(02.11)where Am Bn Xp, with (m+n):p=2:3

(02.11.11)Dana Group

02.11.11.01 Buckhornite AuPb2BiTe2S3 P mmm 2/m 2/m 2/m

Strunz Class:

02.HB.20b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HB -With Cu, Ag, Hg, Fe, Sn and Pb

02.HB.20b Buckhornite AuPb2BiTe2S3 P mmm 2/m 2/m 2/m

Other Buckhornite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Buckhornite :
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 Buckhornite Specimen Label here :

Buckhornite

AuPb2BiTe2S3
Dana No: 02.11.11.01 Strunz No: 02.HB.20b
Locality:

Notes: