Quadratite
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About Quadratite
Formula:
Ag(Cd,Pb)AsS3
Colour:
Gray; reddish (laminae)
Lustre:
Metallic
Hardness:
3
Specific Gravity:
5.31 (Calculated)
Crystal System:
Tetragonal
Name:
The name is derived from the conspicuous quadratic shape of the mineral.
Type Locality:
Classification of Quadratite
Approved
First published:
1998
2/E.07-60
2.GC.25
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
Physical Properties of Quadratite
Metallic
Transparency:
Translucent, Opaque
Colour:
Gray; reddish (laminae)
Streak:
Reddish-brown
Hardness:
3 on Mohs scale
Hardness:
VHN10=52 - 72 kg/mm2 - Vickers
Tenacity:
Flexible
Cleavage:
Perfect
Perfect {001} and distinct {110}
Perfect {001} and distinct {110}
Comment:
Ductile to flexible in thin laminae
Density:
5.31 g/cm3 (Calculated)
Chemical Properties of Quadratite
Formula:
Ag(Cd,Pb)AsS3
IMA Formula:
AgCdAsS3
Crystallography of Quadratite
Crystal System:
Tetragonal
Cell Parameters:
a = 5.5229(4) Å, c = 33.399(5) Å
Ratio:
a:c = 1 : 6.047
Unit Cell V:
1018.8 ų
Z:
8
Morphology:
Crystals tabular, showing a large {001}, with {103}, {104}, {111}, and {116}.
Twinning:
Rarely twinned along (016)
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0019742 | Quadratite | Bindi L, Spry P G, Bonazzi P, Makovicky E, Balic-Zunic T (2013) Quadratite, AgCdAsS3:Chemical composition, crystal structure and OD character American Mineralogist 98 242-247 | 2013 | Lengenbach, Binntal, Switzerland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.19 Å | (50) |
2.77 Å | (100) |
1.960 Å | (80) |
1.679 Å | (70) |
1.598 Å | (70) |
1.274 Å | (60) |
Type Occurrence of Quadratite
General Appearance of Type Material:
Occurs as characteristic quadratic crystals, some of which are octagonal in shape, rarely to 1 mm
Place of Conservation of Type Material:
Natural History Museum in Basel, and in the Mineralogical Institute, University of Basel, Switzerland.
Associated Minerals at Type Locality:
Reference:
Gräser, S., Lustenhouwer, W., Berlepsch, P. (1998) Quadratite Ag(Cd,Pb)(As,Sb)S3 - a new sulfide mineral from Lengenbach, Binntal (Switzerland). Schweizerische Mineralogische und Petrographische Mitteilungen: 78: 489-494.
Synonyms of Quadratite
Other Language Names for Quadratite
German:Quadratit
Spanish:Quadratita
Common Associates
Associated Minerals Based on Photo Data:
9 photos of Quadratite associated with Smithite | AgAsS2 |
7 photos of Quadratite associated with Jordanite | Pb14(As,Sb)6S23 |
2 photos of Quadratite associated with Greenockite | CdS |
1 photo of Quadratite associated with Galena | PbS |
1 photo of Quadratite associated with Seligmannite | PbCuAsS3 |
1 photo of Quadratite associated with Marrite | AgPbAsS3 |
1 photo of Quadratite associated with Wurtzite | (Zn,Fe)S |
Related Minerals - Nickel-Strunz Grouping
2.GC.05 | Hatchite | AgTlPbAs2S5 | Tric. 1 : P1 |
2.GC.05 | Wallisite | (Cu,Ag)TlPbAs2S5 | Tric. |
2.GC.10 | Sinnerite | Cu6As4S9 | Tric. 1 : P1 |
2.GC.15 | Watanabeite | Cu4(As,Sb)2S5 | Orth. |
2.GC.20 | Simonite | TlHgAs3S6 | Mon. 2/m |
2.GC.25 | Manganoquadratite | AgMnAsS3 | Tet. 4 2 2 : P43 2 2 |
2.GC.30 | Smithite | AgAsS2 | Mon. 2/m |
2.GC.35 | Trechmannite | AgAsS2 | Trig. |
2.GC.40a | Aleksite | PbBi2Te2S2 | Trig. |
2.GC.40b | Kochkarite | PbBi4Te7 | Trig. |
2.GC.40c | Poubaite | PbBi2(Se,Te,S)4 | Trig. |
2.GC.40c | Rucklidgeite | PbBi2Te4 | Trig. |
2.GC.40e | Babkinite | Pb2Bi2(S,Se)3 | Trig. |
2.GC.40d | Saddlebackite | Pb2Bi2Te2S3 | Hex. |
2.GC.45 | Tvalchrelidzeite | Hg3SbAsS3 | Mon. 2/m |
2.GC.50 | Mutnovskite | Pb4As2S6ICl | Orth. mmm (2/m 2/m 2/m) : Pnma |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Quadratite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gräser, S., Lustenhouwer, W., Berlepsch, P. (1998) Quadratite Ag(Cd,Pb)(As,Sb)S3 - a new sulfide mineral from Lengenbach, Binntal (Switzerland). Schweizerische Mineralogische und Petrographische Mitteilungen: 78: 489-494.
Berlepsch P., Balić-Žunić, T., Makovicky, E. (1999) The superposition structure of quadratite Ag(Cd,Pb)AsS3. 1s. Det 30. Danske Krystallografmøde, Forskningscenter Risø 1999. Abstract 30.
Bindi, L., Spry, P. G., Bonazzi, P., Makovicky, E., Balić-Žunić, T. (2013) Quadratite, AgCdAsS3: Chemical composition, crystal structure and OD character. American Mineralogist: 98: 242-247.
Internet Links for Quadratite
mindat.org URL:
https://www.mindat.org/min-7262.html
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Localities for Quadratite
Locality List




All localities listed without proper references should be considered as questionable.
Switzerland (TL) | |
| Gräser, S., Lustenhouwer, W., Berlepsch, P. (1998) Quadratite Ag(Cd,Pb)(As,Sb)S3 - a new sulfide mineral from Lengenbach, Binntal (Switzerland). Schweizerische Mineralogische und Petrographische Mitteilungen: 78: 489-494. |
Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland