Chemistry:Playfairite
| Playfairite | |
|---|---|
 | |
| General | |
| Category | Sulfosalt minerals, Sulfides |
| Formula (repeating unit) | Pb16Sb18S43 |
| Strunz classification | 2.LB.30 (10 ed) 2/E.20-40 (8 ed) |
| Dana classification | 3.6.4.1 |
| Crystal system | Monoclinic Unknown space group |
| Identification | |
| Color | Lead gray to black |
| Cleavage | Perfect |
| Mohs scale hardness | 3.5-4 |
| |re|er}} | Metallic |
| Streak | Black |
| Specific gravity | 5.72 |
| Pleochroism | Strong reflection |
| References | [1] |
Playfairite is a rare sulfosalt mineral with chemical formula Pb16Sb18S43 in the monoclinic crystal system,[3][4] named after the Scottish scientist and mathematician John Playfair.[5] It was discovered in 1966 by the Canadian mineralogist John Leslie Jambor.[1][6][7] Lead gray to black in color, its luster is metallic. Playfairite shows strong reflection pleochroism from white to brownish gray. Playfairite has a hardness of 3.5 to 4 on Mohs scale and a specific gravity of approximately 5.72.[3]
The type locality is Taylor Pit (Concession XIV; Lot 13), Huntingdon Township, Hastings County in Ontario, Canada .[3] Small deposits have also been found in Les Cougnasses Mine, Orpierre in the Haut-Alpes in France , Khaidarkan Sb-Hg deposit (Chaidarkan), Fergana Valley, Alai Range, Osh Oblast, Kyrgyzstan and Reese River District, Lander County, Nevada, United States .[3]
See also
- List of minerals recognized by the International Mineralogical Association
References
- ↑ 1.0 1.1 Jambor, J.L. (1967). "New lead sulfantimonides from Madoc, Ontario; Part 2, Mineral descriptions". Canadian Mineralogist 9: 194–196. http://rruff.geo.arizona.edu/doclib/cm/vol9/CM9_191.pdf.
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
- ↑ 3.0 3.1 3.2 3.3 "Information page for Playfairite". Mindat. http://www.mindat.org/min-3239.html.
- ↑ "Information page for Playfairite". Webmineral. http://webmineral.com/data/Playfairite.shtml.
- ↑ "Information page for Playfairite". Handbook of Mineralogy. http://www.handbookofmineralogy.org/pdfs/playfairite.pdf.
- ↑ Michael Fleischer (1968), "New Mineral Names", American Mineralogist 53: 1424, http://www.minsocam.org/ammin/AM53/AM53_1421.pdf
- ↑ Lynne Jambor and John Dutrizac (2008), Memorial of John L. Jambor (1936-2008), American Mineralogist, vol. 93, pp. 710-712
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