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Guanajuatite Mineral Data
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General Guanajuatite Information
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 Chemical Formula: |
Bi2Se3 |
| Composition: |
Molecular Weight = 654.84 gm |
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Bismuth 63.83 % Bi |
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Selenium 36.17 % Se |
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______ |
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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 |
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PDF 77-2016 |
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Guanajuatite Image |
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Images:
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Guanajuatite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm |
| X Ray Diffraction: |
By Intensity(I/Io): 3.19(1), 3.65(0.9), 1.989(0.7), |
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Physical Properties of Guanajuatite
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| 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 |
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Optical Properties of Guanajuatite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
41.20 |
51.80 |
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| 420 nm |
41.80 |
51.80 |
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| 440 nm |
42.30 |
51.90 |
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| 460 nm |
42.80 |
51.90 |
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| 480 nm |
43.30 |
52.00 |
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| 500 nm |
43.30 |
52.00 |
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| 520 nm |
43.30 |
52.00 |
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| 540 nm |
43.10 |
52.00 |
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| 560 nm |
42.90 |
52.00 |
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| 580 nm |
42.70 |
52.20 |
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| 600 nm |
42.40 |
52.20 |
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| 620 nm |
42.20 |
52.10 |
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| 640 nm |
41.90 |
51.90 |
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| 660 nm |
41.50 |
51.60 |
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| 680 nm |
41.20 |
51.20 |
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| 700 nm |
40.80 |
50.70 |
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Calculated Relative Intensity Colors of Guanajuatite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
| R1 |
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| R2 |
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Calculated Properties of Guanajuatite
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| Electron Density: |
Bulk Density (Electron Density)=6.57 gm/cc
note: Specific Gravity of Guanajuatite =8.03 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEGuanajuatite =1,285.88 barns/electron
U=PEGuanajuatite x rElectron Density=8,451.74 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Guanajuatite is Not Radioactive |
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Guanajuatite Classification
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| Dana Class: |
02.11.02.04 (02)Sulfides - Including Selenides and Tellurides |
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(02.11)where Am Bn Xp, with (m+n):p=2:3 |
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(02.11.02)Stibnite Group (Orthorhombic: Pbnm) |
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02.11.02.01 Stibnite Sb2S3 Pbnm 2/m 2/m 2/m |
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02.11.02.02 Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m |
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02.11.02.03 Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m |
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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 |
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02.D - Metal Sulfides, M:S = 3:4 and 2:3 |
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02.DB -M:S = 2:3 and similar |
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02.DB.05a Antimonselite Sb2Se3 Pbnm 2/m 2/m 2/m |
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02.DB.05a Bismuthinite Bi2S3 Pbnm 2/m 2/m 2/m |
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02.DB.05a Guanajuatite Bi2Se3 Pbnm 2/m 2/m 2/m |
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02.DB.05a Metastibnite Sb2S3 None |
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02.DB.05a Stibnite Sb2S3 Pbnm 2/m 2/m 2/m |
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Other Guanajuatite Information
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| 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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Guanajuatite
Bi2Se3
Dana No: 02.11.02.04 Strunz No: 02.DB.05a
Locality:
Notes:
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