Paraguanajuatite Mineral Data

Paraguanajuatite Mineral Data +

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General Paraguanajuatite Information

Chemical Formula:

Bi2(Se,S)3

Composition:

Molecular Weight = 691.82 gm

Bismuth 60.41 % Bi

Selenium 25.68 % Se

Sulfur 13.91 % S

______

100.00 %

Empirical Formula:

Bi₂Se_2.25S₃

Environment:

Intergrown with guanajuatite in contact metamorhpic as wall as in hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1948

Locality:

Santa Catarina mine, Sierra de Santa Rosa, Guanajuato, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for the supposed relationship to guanajuatite.

Synonym:

ICSD 20385

PDF 33-214

Paraguanajuatite Image

Images:

Click Here for Larger Paraguanajuatite Image

Paraguanajuatite Platynite

Comments: Bright metallic gray platy crystalline platynite, with dull black paraguanajuatite.
Location: Falun, Kopparberg, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Paraguanajuatite Crystallography

Axial Ratios:

a:c = 1:6.92363

Cell Dimensions:

a = 4.125, c = 28.56, Z = 3; V = 420.86 Den(Calc)= 8.19

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 3.03(1), 2.23(0.6), 1.404(0.4),

Physical Properties of Paraguanajuatite

Cleavage:

[0001] Perfect

Color:

Lead gray, Yellowish white.

Density:

6.6

Diaphaniety:

Opaque

Fracture:

Flexible - Flexible fragments.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Streak:

gray

Optical Properties of Paraguanajuatite

RL Anisotrophism:

Distinct.

RL Pleochroism:

Distinct in air.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Paraguanajuatite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	47.00	51.70
420 nm	48.10	52.60
440 nm	49.20	53.50
460 nm	50.00	54.20
480 nm	50.50	54.60
500 nm	50.90	55.00
520 nm	51.10	55.10
540 nm	51.00	55.00
560 nm	50.80	54.60
580 nm	50.50	54.20
600 nm	50.00	53.70
620 nm	49.50	53.00
640 nm	48.80	52.20
660 nm	48.20	51.50
680 nm	47.40	50.60
700 nm	46.50	49.80

**Calculated Relative Intensity Colors of Paraguanajuatite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%
R₁
R₂

Calculated Properties of Paraguanajuatite

Electron Density:

r_electron=6.88 gm/cc
note: r_{Paraguanajuatite}=8.19 gm/cc.

Fermion Index

Fermion Index = 0.02056
Boson Index = 0.97944

Photoelectric:

PE_{Paraguanajuatite}=1,180.03 barns/electron
U=PE_{Paraguanajuatite} x r_electron=8,116.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paraguanajuatite is Not Radioactive

Paraguanajuatite Classification

Dana Class:

2.11.7.4 (2)Sulfides - Including Selenides and Tellurides

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

(2.11.7)Tetradymite Group (Trigonal: R-3m)

2.11.7.1 Tetradymite Bi2Te2S R 3m 3 2/m

2.11.7.2 Tellurobismuthite Bi2Te3 R 3m 3 2/m

2.11.7.3 Tellurantimony Sb2Te3 R 3m 3 2/m

2.11.7.4 Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m

2.11.7.5 Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m

2.11.7.6 Skippenite Bi2Se2(Te,S) R 3m 3 2/m

Strunz Class:

II/D.09-30 II - Sulfides and sulphosalts

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

II/D.09 - Tetradymite group, Tellurantimony - Kawazulite series

II/D.09-10 Tellurantimony Sb2Te3 R 3m 3 2/m

II/D.09-20 Tellurobismuthite Bi2Te3 R 3m 3 2/m

II/D.09-30 Paraguanajuatite Bi2(Se,S)3 R 3m 3 2/m

II/D.09-50 Skippenite Bi2Se2(Te,S) R 3m 3 2/m

II/D.09-60 Tetradymite Bi2Te2S R 3m 3 2/m

II/D.09-70 Kawazulite Bi2(Te,Se,S)3 R 3m 3 2/m

Other Paraguanajuatite Information

References:

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

See Also:

Links to other databases for Paraguanajuatite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Paraguanajuatite

Bi2(Se,S)3
Dana No: 2.11.7.4 Strunz No: II/D.09-30
Locality:

Notes: