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Playfairite

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John Playfair
Formula:
Pb16(Sb,As)19S44Cl
Originally assumed to be Pb16Sb18S43.
System:
Monoclinic
Colour:
Lead gray to black
Hardness:
3½ - 4
Name:
Name: Honors John Playfair (1748-1819), Scottish mathematician, physicist, and geologist, Professor of Mathematics and Natural History (1785-1819), University of Edinburgh, Scotland. He is best known for his pioneering work on geomorphology.
This page provides mineralogical data about Playfairite.

Classification of Playfairite

Approved 1966
2.LB.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
L : Unclassified Sulfosalts
B : With essential Pb
3.6.4.1

3 : SULFOSALTS
6 : 2 < ø < 2.49
5.6.12

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
6 : Sulpharsenites etc. of Pb alone
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http://www.mindat.org/min-3239.html
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First Recorded Occurrence of Playfairite

Year of Discovery:
1966

Occurrences of Playfairite

Geological Setting:
Dolomitic and calcitic marbles. Coating sulfosalt minerals.

Physical Properties of Playfairite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Lead gray to black
Streak:
Black
Hardness (Mohs):
3½ - 4
Hardness (Vickers):
VHN50=154 kg/mm2
Cleavage:
Perfect
on {100}
Density:
5.72 g/cm3 (Calculated)

Crystallography of Playfairite

Crystal System:
Monoclinic
Cell Parameters:
a = 45.12Å, b = 8.29Å, c = 21.45Å
β = 92.53°
Ratio:
a:b:c = 5.443 : 1 : 2.587
Unit Cell Volume:
V 8,015.44 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular crystals
Twinning:
Very fine twin lamellae

Chemical Properties of Playfairite

Formula:
Pb16(Sb,As)19S44Cl

Originally assumed to be Pb16Sb18S43.
Essential elements:
All elements listed in formula:
Common Impurities:
As

Relationship of Playfairite to other Species

2.LB.05MiharaiteCu4FePbBiS6
2.LB.30ArdaitePb19Sb13S35Cl7
2.LB.30LaunayiteCuPb10(Sb,As)12S20
2.LB.30MadocitePb19(Sb,As)16S43
2.LB.30SorbyiteCuPb9(Sb,As)11S26
2.LB.30SterryiteAg2Pb10(Sb,As)12S29
2.LB.35Larosite(Cu,Ag)21(Pb,Bi)2S13
2.LB.40PetroviciteCu3HgPbBiSe5
2.LB.40MazzettiiteAg3HgPbSbTe5
2.LB.45CreraritePt2-x(Bi,Pb)11(S,Se)11
5.6.1SartoritePbAs2S4
5.6.2DufrénoysitePb2As2S5
5.6.3LiveingitePb9As13S28
5.6.4BaumhaueritePb12As16S36
5.6.5GratonitePb9As4S15
5.6.6JordanitePb14(As,Sb)6S23
5.6.7FülöppitePb3Sb8S15
5.6.8ZinkenitePb9Sb22S42
5.6.9PlagionitePb5Sb8S17
5.6.10HeteromorphitePb7Sb8S19
5.6.11LaunayiteCuPb10(Sb,As)12S20
5.6.13SemseyitePb9Sb8S21
5.6.14MadocitePb19(Sb,As)16S43
5.6.15BoulangeritePb5Sb4S11
5.6.17RobinsonitePb4Sb6S13
5.6.18GuettarditePbAsSbS4
5.6.19Twinnite Pb0.8Tl0.1Sb1.3As0.8S4
5.6.20VeenitePb2(Sb,As)2S5
5.6.21SorbyiteCuPb9(Sb,As)11S26
5.6.22GeocronitePb14(Sb,As)6S23
5.6.23GalenobismutitePbBi2S4
5.6.24CosalitePb2Bi2S5
5.6.25CannizzaritePb4Bi6S13
5.6.26LillianitePb3-2xAgxBi2+xS6
5.6.27GiessenitePb27Cu2(Bi,Sb)19S57
5.6.28Platynite
5.6.29XilingolitePb3Bi2S6
5.6.30WeibullitePb5Bi8Se7S11
5.6.31WittitePb9Bi12(S,Se)27
5.6.32KirkiitePb10Bi3As3S19
5.6.33UstarasitePb(Bi,Sb)6S10 (?)

Other Names for Playfairite

Name in Other Languages:
German:Playfairit
Spanish:Playfairita

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 Playfairite

Reference List:
JAMBOR, J.L. (1967): New lead sulfantimonides from Madoc, Ontario. 1. Canadian Mineralogist 9, 7-24.

JAMBOR, J.L. (1967): New lead sulfantimonides from Madoc, Ontario. 2. Mineral descriptions. Canadian Mineralogist 9, 191-213.

JAMBOR, J.L. (1968): New lead sulfantimonides from Madoc, Ontario. 3. Syntheses, paragenesis, origin. Canadian Mineralogist 10, 507-521.

JAMBOR, J.L., LAFLAMME, J.H.G. & WALKER, D.A. (1982): A re-examination of the Madoc sulfosalts. Mineralogical Record 13, 93-100.

Internet Links for Playfairite

Localities for Playfairite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada
 
  • Ontario
    • Hastings Co.
      • Madoc area
        • Huntingdon Township
JAMBOR, J.L. (1967): New lead sulfantimonides from Madoc, Ontario. 1. Canadian Mineralogist 9, 7-24. JAMBOR, J.L. (1967): New lead sulfantimonides from Madoc, Ontario. 2. Mineral descriptions. Canadian Mineralogist 9, 191-213. JAMBOR, J.L. (1968): New lead sulfantimonides from Madoc, Ontario. 3. Syntheses, paragenesis, origin. Canadian Mineralogist 10, 507-521. JAMBOR, J.L., LAFLAMME, J.H.G. & WALKER, D.A. (1982): A re-examination of the Madoc sulfosalts. Mineralogical Record 13, 93-100.
France
 
  • Provence-Alpes-Côte d'Azur
    • Hautes-Alpes
      • Orpierre
Y. Moelo et al. : "Playfairite,(chlorosulfosel de plomb) du gisement des Cougnasses (Hautes Alpes), Bull. Soc. Fr. Minéral. Cristallogr. , 1987
Kyrgyzstan
 
  • Osh Oblast
    • Alai Range (Alay Range)
      • Fergana Valley
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
USA
 
  • Nevada
    • Lander Co.
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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