English: (A) aggregate of Ba-minerals between large rock-forming minerals of paralava, Zuk Tamrur. Frame shows a fragment magnified in Figure 3B; (B) walstromite intergrowing with zadovite and gurimite is partially replaced by pliniusite. Kalsilite, in enclaves containing walstromite, is intensively substituted by a mixture of hydrosilicates and zeolites; (C) one of the biggest poikilitic grain of walstromite with kalsilite inclusions and Ti- andradite-flamite (partly altered) eutectoid intergrowth, Zuk Tamrur; (D) Euhedral zadovite crystals in walstromite, zadovite partially substituted for fluorapatite, Gurim Anticline. Adr: andradite, Ap: fluorapatite, Brt: baryte, Cus: cuspidine, Ghl: gehlenite, Grm: gurimite, His: hydrosilicate, Pls: pliniusite, Rnk: rankinite, Tnr: tenorite, Wls: walstromite, Zdv: zadovite, Mgf: magnesioferrite, Kls: kalsilite. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).