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Quadratite

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About QuadratiteHide

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.
The Cd analogue of manganoquadratite.


Classification of QuadratiteHide

Approved
First published:
1998
2.GC.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites

Physical Properties of QuadratiteHide

Metallic
Transparency:
Translucent, Opaque
Colour:
Gray; reddish (laminae)
Streak:
Reddish-brown
Hardness:
Hardness:
VHN10=52 - 72 kg/mm2 - Vickers
Tenacity:
Flexible
Cleavage:
Perfect
Perfect {001} and distinct {110}
Comment:
Ductile to flexible in thin laminae
Density:
5.31 g/cm3 (Calculated)

Chemical Properties of QuadratiteHide

Formula:
Ag(Cd,Pb)AsS3
IMA Formula:
AgCdAsS3

Crystallography of QuadratiteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019742QuadratiteBindi L, Spry P G, Bonazzi P, Makovicky E, Balic-Zunic T (2013) Quadratite, AgCdAsS3:Chemical composition, crystal structure and OD character American Mineralogist 98 242-2472013Lengenbach, Binntal, Switzerland0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 QuadratiteHide

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 QuadratiteHide

Other Language Names for QuadratiteHide

German:Quadratit
Spanish:Quadratita

Common AssociatesHide

Associated Minerals Based on Photo Data:
9 photos of Quadratite associated with SmithiteAgAsS2
7 photos of Quadratite associated with JordanitePb14(As,Sb)6S23
2 photos of Quadratite associated with GreenockiteCdS
1 photo of Quadratite associated with GalenaPbS
1 photo of Quadratite associated with SeligmannitePbCuAsS3
1 photo of Quadratite associated with MarriteAgPbAsS3
1 photo of Quadratite associated with Wurtzite(Zn,Fe)S

Related Minerals - Nickel-Strunz GroupingHide

2.GC.05HatchiteAgTlPbAs2S5Tric. 1 : P1
2.GC.05Wallisite(Cu,Ag)TlPbAs2S5Tric.
2.GC.10SinneriteCu6As4S9Tric. 1 : P1
2.GC.15WatanabeiteCu4(As,Sb)2S5Orth.
2.GC.20SimoniteTlHgAs3S6Mon. 2/m
2.GC.25ManganoquadratiteAgMnAsS3Tet. 4 2 2 : P43 2 2
2.GC.30SmithiteAgAsS2Mon. 2/m
2.GC.35TrechmanniteAgAsS2Trig.
2.GC.40aAleksitePbBi2Te2S2Trig.
2.GC.40bKochkaritePbBi4Te7Trig.
2.GC.40cPoubaitePbBi2(Se,Te,S)4Trig.
2.GC.40cRucklidgeitePbBi2Te4Trig.
2.GC.40eBabkinitePb2Bi2(S,Se)3Trig.
2.GC.40dSaddlebackitePb2Bi2Te2S3Hex.
2.GC.45TvalchrelidzeiteHg3SbAsS3Mon. 2/m
2.GC.50MutnovskitePb4As2S6IClOrth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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 QuadratiteHide

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 QuadratiteHide

Localities for QuadratiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Switzerland (TL)
 
  • Valais
    • Goms
      • Binn
        • Fäld
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.
 
Mineral and/or Locality  
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