Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia)
Potassium sulfide KFeS<sub>2</sub> (hanswilkeite) has been identified in polymineralic inclusions in a diamond from the Udachnaya kimberlite pipe (Siberian craton, Yakutia). This is the second occurrence of hanswilkeite in nature and the first one in mantle-derived samples. Sulfide KFeS&...
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MDPI AG
2023-06-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/7/874 |
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| author | Alla M. Logvinova Igor S. Sharygin |
| author_facet | Alla M. Logvinova Igor S. Sharygin |
| author_sort | Alla M. Logvinova |
| collection | DOAJ |
| description | Potassium sulfide KFeS<sub>2</sub> (hanswilkeite) has been identified in polymineralic inclusions in a diamond from the Udachnaya kimberlite pipe (Siberian craton, Yakutia). This is the second occurrence of hanswilkeite in nature and the first one in mantle-derived samples. Sulfide KFeS<sub>2</sub> is monoclinic, the space group—C 2/c. Its crystal structure consists of chains with K in the interstices. The tetrahedra are centered by iron ions and linked by edges, thus forming chains of [FeS<sub>2</sub>] frameworks. The strongest lines of the electron diffraction powder pattern are 7.05 Å—(200); 5.34 Å (0<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0); and 3.05 Å (2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0), and the angles between directions are <2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0/0<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0>—60° and <2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0/200>—30°. KFeS<sub>2</sub> has been found as a discrete phase within polymineralic inclusions consisting of apatite, ilmenite, chondrodite, phlogopite, dolomite, and a fluid phase. The data obtained from the composition of the hanswilkeite (KFeS<sub>2</sub>) inclusion and other rare minerals (chondrodite, Mg-apatite, Cr-ilmenite) in primary inclusions in a diamond from the Udachnaya kimberlite testify to the important role of metasomatic processes in diamond formation. |
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| language | English |
| last_indexed | 2024-03-11T00:47:47Z |
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| spelling | doaj.art-47fc0d1fd30f481fab7fe89b124d501b2023-11-18T20:38:12ZengMDPI AGMinerals2075-163X2023-06-0113787410.3390/min13070874Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia)Alla M. Logvinova0Igor S. Sharygin1V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Koptyuga Pr. 3, Novosibirsk 630090, RussiaV. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Koptyuga Pr. 3, Novosibirsk 630090, RussiaPotassium sulfide KFeS<sub>2</sub> (hanswilkeite) has been identified in polymineralic inclusions in a diamond from the Udachnaya kimberlite pipe (Siberian craton, Yakutia). This is the second occurrence of hanswilkeite in nature and the first one in mantle-derived samples. Sulfide KFeS<sub>2</sub> is monoclinic, the space group—C 2/c. Its crystal structure consists of chains with K in the interstices. The tetrahedra are centered by iron ions and linked by edges, thus forming chains of [FeS<sub>2</sub>] frameworks. The strongest lines of the electron diffraction powder pattern are 7.05 Å—(200); 5.34 Å (0<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0); and 3.05 Å (2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0), and the angles between directions are <2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0/0<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0>—60° and <2<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover><mn>2</mn><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula>0/200>—30°. KFeS<sub>2</sub> has been found as a discrete phase within polymineralic inclusions consisting of apatite, ilmenite, chondrodite, phlogopite, dolomite, and a fluid phase. The data obtained from the composition of the hanswilkeite (KFeS<sub>2</sub>) inclusion and other rare minerals (chondrodite, Mg-apatite, Cr-ilmenite) in primary inclusions in a diamond from the Udachnaya kimberlite testify to the important role of metasomatic processes in diamond formation.https://www.mdpi.com/2075-163X/13/7/874diamondpotassium sulfideinclusionkimberlitemantlecraton |
| spellingShingle | Alla M. Logvinova Igor S. Sharygin Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia) Minerals diamond potassium sulfide inclusion kimberlite mantle craton |
| title | Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia) |
| title_full | Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia) |
| title_fullStr | Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia) |
| title_full_unstemmed | Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia) |
| title_short | Second Natural Occurrence of KFeS<sub>2</sub> (Hanswilkeite): An Inclusion in Diamond from the Udachnaya Kimberlite Pipe (Siberian Craton, Yakutia) |
| title_sort | second natural occurrence of kfes sub 2 sub hanswilkeite an inclusion in diamond from the udachnaya kimberlite pipe siberian craton yakutia |
| topic | diamond potassium sulfide inclusion kimberlite mantle craton |
| url | https://www.mdpi.com/2075-163X/13/7/874 |
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