Guanajuatite Mineral Data

General Guanajuatite Information

Chemical Formula:

Bi2Se3

Composition:

Molecular Weight = 654.84 gm

Bismuth 63.83 % Bi

Selenium 36.17 % Se

______

100.00 %

Empirical Formula:

Bi₂Se₃

Environment:

In hydrothermal deposits of low to moderate temperatures.

IMA Status:

Valid Species (Pre-IMA) 1873

Locality:

In the Santa Catarina and La Industrial mines, Sierra de Santa Rosa, near Guanajuato, Mexico. Link to MinDat.org Location Data.

Name Origin:

For the locality.

Name Pronunciation:

Guanajuatite + Pronunciation

Synonym:

ICSD 60205

PDF 77-2016

Guanajuatite Image

Images:

Guanajuatite

Comments: Prismatic crystalline guanajuatite, altering to a blue crust, in white calcite.
Location: Falun, Kopparberg, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Guanajuatite Crystallography

Axial Ratios:

a:b:c =0.986:1:0.3632

Cell Dimensions:

a = 11.32, b = 11.48, c = 4.17, Z = 4; V = 541.91 Den(Calc)= 8.03

Crystal System:

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

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

By Intensity(I/I_o): 3.19(1), 3.65(0.9), 1.989(0.7),

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

Caracas R , Gonze X , Physics and Chemistry of Minerals , 32 (2005) p.295-300, First-principles study of the electronic properties of A2B3 minerals,, with A=Bi,Sb and B=S,Se, Note: Hypothetical sulphosalt structure derived from density functional theory

Physical Properties of Guanajuatite

Cleavage:

{010} Distinct, {001} Indistinct

Color:

Lead gray, Bluish gray.

Density:

6.25 - 6.98, Average = 6.61

Diaphaneity:

Opaque

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2.5-3.5 - Finger Nail-Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

gray

Optical Properties of Guanajuatite

RL Anisotrophism:

Strong.

RL Color:

White with a yellowish hue.

RL Pleochroism:

Distinct.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Guanajuatite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	41.20	51.80
420 nm	41.80	51.80
440 nm	42.30	51.90
460 nm	42.80	51.90
480 nm	43.30	52.00
500 nm	43.30	52.00
520 nm	43.30	52.00
540 nm	43.10	52.00
560 nm	42.90	52.00
580 nm	42.70	52.20
600 nm	42.40	52.20
620 nm	42.20	52.10
640 nm	41.90	51.90
660 nm	41.50	51.60
680 nm	41.20	51.20
700 nm	40.80	50.70

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

Calculated Properties of Guanajuatite

Electron Density:

Bulk Density (Electron Density)=6.57 gm/cc
note: Specific Gravity of Guanajuatite =8.03 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Guanajuatite=1,285.88 barns/electron
U=PE_Guanajuatite x rElectron Density=8,451.74 barns/cc.

Radioactivity:

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

Guanajuatite Classification

Dana Class:

02.11.02.04 (02)Sulfides - Including Selenides and Tellurides

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

(02.11.02)Stibnite Group (Orthorhombic: Pbnm)

02.11.02.01 Stibnite Sb2S3 Pbnm 2/m 2/m 2/m

02.11.02.02 Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m

02.11.02.03 Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m

02.11.02.04 Guanajuatite Bi2Se3 Pbnm 2/m 2/m 2/m

Strunz Class:

02.DB.05a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.D - Metal Sulfides, M:S = 3:4 and 2:3

02.DB -M:S = 2:3 and similar

02.DB.05a Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m

02.DB.05a Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m

02.DB.05a Guanajuatite Bi2Se3 Pbnm 2/m 2/m 2/m

02.DB.05a Metastibnite Sb2S3 None

02.DB.05a Stibnite Sb2S3 Pbnm 2/m 2/m 2/m

Other Guanajuatite Information

References:

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

See Also:

Links to other databases for Guanajuatite :
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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Ask about Guanajuatite here :
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Print or Cut-and-Paste your Guanajuatite Specimen Label here :

Guanajuatite

Bi2Se3
Dana No: 02.11.02.04 Strunz No: 02.DB.05a
Locality:

Notes: