Pirquitasite Mineral Data (original) (raw)
General Pirquitasite Information
Chemical Formula:
Ag2ZnSnS4
Composition:
Molecular Weight = 528.10 gm
Zinc 12.38 % Zn
Silver 40.85 % Ag
Tin 22.48 % Sn
Sulfur 24.29 % S
______
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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Images:
Pirquitasite Crystallography
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 - ScalenohedralH-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),
Physical Properties of Pirquitasite
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
Optical Properties of Pirquitasite
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 | R 2 |  |
∑ R1(λ) | ∑ R2(λ) |
|---|---|---|---|---|---|
| 420 nm | 24.60 | 21.70 |  |
||
| 440 nm | 24.20 | 21.80 |  |
||
| 460 nm | 24.10 | 21.90 |  |
||
| 480 nm | 23.90 | 21.90 |  |
||
| 500 nm | 23.80 | 21.80 |  |
||
| 520 nm | 23.90 | 21.90 |  |
||
| 540 nm | 24.10 | 22.20 |  |
||
| 560 nm | 24.30 | 22.50 |  |
||
| 580 nm | 24.20 | 22.70 |  |
||
| 600 nm | 24.10 | 22.40 |  |
||
| 620 nm | 23.80 | 21.80 |  |
||
| 640 nm | 23.20 | 21.30 |  |
||
| 660 nm | 22.50 | 20.90 |  |
||
| 680 nm | 22.20 | 20.50 |  |
||
| 700 nm | 21.60 | 20.10 |  |
Calculated Relative Intensity Colors of Pirquitasite in Air
| RelativeIntensity | 0% | 50% | 100% | 150% | 200% | 250% | 300% | 350% | 400% | 410% |
|---|---|---|---|---|---|---|---|---|---|---|
| R1 | ||||||||||
| R2 |
Calculated Properties of Pirquitasite
Electron Density:
Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Pirquitasite =4.84 gm/cc.
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.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pirquitasite is Not Radioactive
Pirquitasite Classification
Dana Class:
02.09.02.07 (02)Sulfides - Including Selenides and Tellurides
(02.09)where Am Bn Xp, with (m+n):p=1:1
(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type
02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m
02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m
02.09.02.03 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m
02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m
02.09.02.05 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic
02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m
02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m
02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m
02.09.02.09 Kesterite Cu2(Zn,Fe)SnS4 I 4 4
02.09.02.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m
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
02.C - Metal Sulfides, M:S = 1:1 (and similar)
02.CB -With Zn, Fe, Cu, Ag, Au, etc
02.CB.15a Cernyite Cu2CdSnS4 I 42m 4 2m
02.CB.15a Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m
02.CB.15a Kesterite Cu2(Zn,Fe)SnS4 I 4 4
02.CB.15a Hocartite Ag2FeSnS4 I 42m 4 2m
02.CB.15a Idaite Cu5FeS6 P 63/mmc 6/m 2/m 2/m
02.CB.15a Kuramite Cu3SnS4 I 42m 4 2m
02.CB.15a Pirquitasite Ag2ZnSnS4 I 42m 4 2m
02.CB.15a Stannite Cu2FeSnS4 I 42m 4 2m
02.CB.15a Velikite Cu2HgSnS4 I 42m 4 2m
Other Pirquitasite Information
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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Print or Cut-and-Paste your Pirquitasite Specimen Label here :
Pirquitasite
Ag2ZnSnS4
Dana No: 02.09.02.07 Strunz No: 02.CB.15a
Locality:
Notes: