 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 1]](dk5111fig1mag.jpg)
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Figure 1
Comparison of the structures of calaverite (a), sylvanite (b), muthmannite (c) and krennerite (d). Gold and silver atoms are represented by the corresponding colour, tellurium is dark-olive-green. In the structure of sylvanite two types of polyhedra for Au3+ (slightly distorted square planar coordination) and Au+/Ag+ (highly distorted octahedron) alternate forming sheets that are held together by Te—Te bonds much stronger than those in calaverite. The structure of muthmannite is built on edge-sharing highly distorted rhombic bipyramids centred on Au+ and on Ag+, similar to those in calaverite, forming a three-periodic structure without Te—Te bonds. In the structure of krennerite two of the three sites host gold and silver, whereas the third site is occupied by gold alone. These corresponding polyhedra form zigzag sheets that are held together by strong Te—Te bonds similar to those found in sylvanite. This and the following structural figures were drawn with VESTA (Momma & Izumi, 2011  ). |
![[Figure 1]](dk5111fig1.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
