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Keywords = hutchinsonite

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74 pages, 66542 KiB  
Review
Modular Crystal Chemistry of Thallium Sulfosalts
by Emil Makovicky
Minerals 2018, 8(11), 478; https://doi.org/10.3390/min8110478 - 24 Oct 2018
Cited by 22 | Viewed by 6473
Abstract
Complex sulfides of thallium with As, Sb, or Bi and with other cations (‘thallium sulfosalts’) are a large group of crystal structures with extreme variability. Incorporation of the large Tl+ cation in them is solved in several different ways: housing of Tl [...] Read more.
Complex sulfides of thallium with As, Sb, or Bi and with other cations (‘thallium sulfosalts’) are a large group of crystal structures with extreme variability. Incorporation of the large Tl+ cation in them is solved in several different ways: housing of Tl in columns of capped trigonal coordination prisms, which form separate walls in the structure (in different combinations with Pb and/or Sb), regular alternation of large Tl with small cations (As), presence of structural arrays of Tl coordination polyhedra paralleled by arrays of As coordination pyramids with a frequency ratio 1:2, omission derivatives with cavities for Tl accommodation and formation of layer structures with thallium concentrated into separate (inter)layers of different types. The first principle leads to a large family of sartorite homologues and rare lillianite homologues, as well as to the chabournéite group. The second one to the hutchinsonite family, omission derivatives form the routhierite and galkhaite groups, and the 1:2 periodicity ratio principle results in several outstanding structures from different groups. Layer structures consist of two-component and three-component layer combinations. Close cation-cation interactions are present but rare. Full article
(This article belongs to the Special Issue Thallium: Mineralogy, Geochemistry and Ore Processes)
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17 pages, 11492 KiB  
Review
The Lengenbach Quarry in Switzerland: Classic Locality for Rare Thallium Sulfosalts
by Thomas Raber and Philippe Roth
Minerals 2018, 8(9), 409; https://doi.org/10.3390/min8090409 - 14 Sep 2018
Cited by 16 | Viewed by 9011
Abstract
The Lengenbach quarry is a world-famous mineral locality, especially known for its rare and well-crystallized Tl, Pb, Ag, and Cu bearing sulfosalts. As of June 2018, it is the type locality for 44 different mineral species, making it one of the most prolific [...] Read more.
The Lengenbach quarry is a world-famous mineral locality, especially known for its rare and well-crystallized Tl, Pb, Ag, and Cu bearing sulfosalts. As of June 2018, it is the type locality for 44 different mineral species, making it one of the most prolific localities worldwide. A total of 33 thallium mineral species have been identified, 23 of which are type minerals. A brief description of several thallium species of special interest follows a concise and general overview of the thallium mineralization. Full article
(This article belongs to the Special Issue Thallium: Mineralogy, Geochemistry and Ore Processes)
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