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Pirquitasite Mineral Data
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General Pirquitasite Information
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 Chemical Formula: |
Ag2ZnSnS4 |
| Composition: |
Molecular Weight = 528.10 gm |
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Zinc 12.38 % Zn |
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Silver 40.85 % Ag |
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Tin 22.48 % Sn |
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Sulfur 24.29 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag2ZnSnS4 |
| Environment: |
Hydrothermal mineralization in veins associated with subvolcanic environments, similer to the Bolivian tin and silver deposits. |
| IMA Status: |
Approved IMA 1980 |
| Locality: |
Pirquitas deposit, Rinconada department, Jujuy province, Argentina Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Pirquitasite + Pronunciation  |
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Pirquitasite Crystallography
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| Axial Ratios: |
a:c = 1:1.87158 |
| Cell Dimensions: |
a = 5.786, c = 10.829, Z = 2; V = 362.53 Den(Calc)= 4.84 |
| Crystal System: |
Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.267(1), 1.735(0.8), 1.976(0.8), |
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Physical Properties of Pirquitasite
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| Cleavage: |
None |
| Color: |
Gray. |
| Density: |
4.822 |
| Diaphaneity: |
Opaque |
| Habit: |
Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks. |
| Habit: |
Twinning Common - Crystals are usually twinned. |
| Hardness: |
4 - Fluorite |
| Luster: |
Metallic |
| Streak: |
brownish gray |
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Optical Properties of Pirquitasite
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| RL Anisotrophism: |
Strong, from brick red to light green. |
| RL Color: |
Brownish gray, with red internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Pirquitasite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
24.60 |
21.70 |
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| 440 nm |
24.20 |
21.80 |
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| 460 nm |
24.10 |
21.90 |
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| 480 nm |
23.90 |
21.90 |
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| 500 nm |
23.80 |
21.80 |
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| 520 nm |
23.90 |
21.90 |
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| 540 nm |
24.10 |
22.20 |
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| 560 nm |
24.30 |
22.50 |
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| 580 nm |
24.20 |
22.70 |
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| 600 nm |
24.10 |
22.40 |
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| 620 nm |
23.80 |
21.80 |
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| 640 nm |
23.20 |
21.30 |
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| 660 nm |
22.50 |
20.90 |
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| 680 nm |
22.20 |
20.50 |
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| 700 nm |
21.60 |
20.10 |
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Calculated Relative Intensity Colors of Pirquitasite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
410% |
| R1 |
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| R2 |
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Calculated Properties of Pirquitasite
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| Electron Density: |
Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Pirquitasite =4.84 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEPirquitasite = 179.94 barns/electron
U=PEPirquitasite x rElectron Density= 784.97 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pirquitasite is Not Radioactive |
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Pirquitasite Classification
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| Dana Class: |
02.09.02.07 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type |
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02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m |
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02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m |
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02.09.02.03 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m |
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02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m |
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02.09.02.05 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic |
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02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m |
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02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m |
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02.09.02.09 Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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02.09.02.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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02.09.02.11 Barquillite! Cu2CdGeS4 I 42m 4 2m |
| Strunz Class: |
02.CB.15a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CB -With Zn, Fe, Cu, Ag, Au, etc |
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02.CB.15a Cernyite Cu2CdSnS4 I 42m 4 2m |
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02.CB.15a Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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02.CB.15a Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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02.CB.15a Hocartite Ag2FeSnS4 I 42m 4 2m |
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02.CB.15a Idaite Cu5FeS6 P 63/mmc 6/m 2/m 2/m |
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02.CB.15a Kuramite Cu3SnS4 I 42m 4 2m |
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02.CB.15a Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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02.CB.15a Stannite Cu2FeSnS4 I 42m 4 2m |
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02.CB.15a Velikite Cu2HgSnS4 I 42m 4 2m |
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Other Pirquitasite 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 Pirquitasite :
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
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Pirquitasite
Ag2ZnSnS4
Dana No: 02.09.02.07 Strunz No: 02.CB.15a
Locality:
Notes:
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