Guanajuatite Mineral Data

Guanajuatite Mineral Data +

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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.

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:

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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

Diaphaniety:

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:

r_electron=6.57 gm/cc
note: r_Guanajuatite=8.03 gm/cc.

Fermion Index

Fermion Index = 0.02749
Boson Index = 0.97251

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Guanajuatite is Not Radioactive

Guanajuatite Classification

Dana Class:

2.11.2.4 (2)Sulfides - Including Selenides and Tellurides

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

(2.11.2)Stibnite Group (Orthorhombic: Pbnm)

2.11.2.1 Stibnite Sb2S3 Pbnm 2/m 2/m 2/m

2.11.2.2 Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m

2.11.2.3 Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m

2.11.2.4 Guanajuatite Bi2Se3 Pbnm 2/m 2/m 2/m

Strunz Class:

II/D.08-50 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.08 - Stibnite - Bismuthinite series

II/D.08-10 Paakkonenite Sb2AsS2 C 2/m 2/m

II/D.08-20 Stibnite Sb2S3 Pbnm 2/m 2/m 2/m

II/D.08-25 Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m

II/D.08-30 Metastibnite Sb2S3 None

II/D.08-40 Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m

II/D.08-50 Guanajuatite Bi2Se3 Pbnm 2/m 2/m 2/m

II/D.08-60 Ottemannite Sn2S3 Pnam 2/m 2/m 2/m

Other Guanajuatite Information

References:

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

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

Guanajuatite

Bi2Se3
Dana No: 2.11.2.4 Strunz No: II/D.08-50
Locality:

Notes: