Siegenite

Siegenite (also called grimmite, or nickel cobalt sulfide) is a ternary transition metal dichalcogenide compound with the chemical formula (Ni,Co) 3 S 4 . It has been actively studied as a promising material system for electrodes in electrochemical energy applications due to its better conductivity, greater mechanical and thermal stability, and higher performance compared to metal oxides currently in use. Potential applications of this material system include supercapacitors, batteries, electrocatalysis, dye-sensitized solar cells, photocatalysis, glucose sensors, and microwave absorption. In synthetic chemistry, a range of chemical compositions with the formula Ni x Co 3−x S 4 (0 2 S 4 is called grimmite, the inverse spinel CoNi 2 S 4 is called siegenite, and the endmembers Ni 2+ (Ni 3+ ) 2 S 4 and Co 2+ (Co 3+ ) 2 S 4 are called polydymite and linnaeite, respectively. In 2020, NiCo 2 S 4 (grimmite) is approved as a valid mineral species by the IMA.

Siegenite (also called grimmite, or nickel cobalt sulfide) is a ternary transition metal dichalcogenide compound with the chemical formula (Ni,Co) 3 S 4 . It has been actively studied as a promising material system for electrodes in electrochemical energy applications due to its better conductivity, greater mechanical and thermal stability, and higher performance compared to metal oxides currently in use. Potential applications of this material system include supercapacitors, batteries, electrocatalysis, dye-sensitized solar cells, photocatalysis, glucose sensors, and microwave absorption. In synthetic chemistry, a range of chemical compositions with the formula Ni x Co 3−x S 4 (0 2 S 4 is called grimmite, the inverse spinel CoNi 2 S 4 is called siegenite, and the endmembers Ni 2+ (Ni 3+ ) 2 S 4 and Co 2+ (Co 3+ ) 2 S 4 are called polydymite and linnaeite, respectively. In 2020, NiCo 2 S 4 (grimmite) is approved as a valid mineral species by the IMA. ==Discovery and occurrence== Siegenite was first described in 1850 for an occurrence in the Stahlberg Mine in Müsen, Siegerland, North Rhine-Westphalia, Germany and named for the locality. It occurs in hydrothermal copper-nickel-iron sulfide bearing veins associated with chalcopyrite, pyrrhotite, galena, sphalerite, pyrite, millerite, gersdorffite and ullmannite. It occurs in a variety of deposits worldwide, including Brestovsko in the central Bosnian Mountains of Serbia; at Kladno in the Czech Republic; Blackcraig, Kirkcudbrightshire, Scotland. In the United States occurrences include the Mine la Motte of Madison County and the Buick mine, Bixby, Iron County and in the Sweetwater mine of Reynolds County in the Lead Belt of Missouri. In Canada, it is known from the Langis mine, Cobalt-Gowganda area, Ontario. In Africa it occurs at Shinkolobwe, Katanga Province and Kilembe, Uganda. In Japan, it is reported from the Kamaishi mine, Iwate Prefecture, and the Yokozuru mine, north Kyushu. It also occurs at Kalgoorlie, Western Australia. It is found at the Browns deposit, Batchelor, Northern Territory, Australia. ==References==

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