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of type specimen from Madagascar; co-type from Myanmar has: a = 15.590(2), c = 7.009(1) Å, V = 1475.3(4) Å3.","euhedral crystals and aggregates, up to 10 mm in diameter",7,"3.128","3.135 cotype","Vitreous","Transparent","white","pink, yellowish-brown to grey or near-colorless",[50,51,52,53,47],"pink","brown","gray","colorless",[47],"a weak dark red fluorescence under short-wave UV light.","Conchoidal","brittle","Uniaxial","-","1.6624","1.639",2,1.639,1.6624,"Weak","slightly pleochroic in plane-polarized transmitted light, featuring a pale gray in the omega direction and colorless in the epsilon direction","ω = 1.6624(5) and ε = 1.6541(3) (co-type)","A late-stage hydrothermal phase in open pockets within highly fractionated, B-rich granitic pegmatite dike of lithium-cesium-tantalum-enriched type (LCT-type).","Type material is deposited in the collections of the Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden, catalogue number GEO-NRM 20180012, the Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA 90007, USA, catalogue number 76302, and the Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, 659 37 Brno, Czech Republic, specimen numbers B12566 and B12567\r\nThe co-type specimen is deposited in the collection of the Natural History Museum in Vienna, Austria (catalogue number O 3207; it includes the crystal fragment used for the crystal-structure determination).","A very B-rich tourmaline species and the first tourmaline with boron-bearing heteroatomic silicate group (diborotetrasilicate); third tourmaline-group representative with heteroatomic silicate group (compare adachiite and alumino-oxy-rossmanite).\r\nForm...","The new mineral ertlite is named in honor of Dr. Andreas Ertl-Winand (previously Ertl), crystallographer, mineralogist, and specialist in tourmaline crystallography at the Natural History Museum of Vienna (Naturhistorisches Museum Wien) and the University of Vienna 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(2024) Ertlite, IMA 2023-086. CNMNC\nNewsletter 79, Mineralogical Magazine, 88",{"id":340,"year":341,"html":342,"doi":343},18479322,2025,"Cempírek, Jan; Jonsson, Erik; Skřápková, Lenka; Škoda, Radek; Kolitsch, Uwe; Čopjaková, Renata; Groat, Lee A.; Kampf, Anthony R.; Lussier, Aaron J.; Hawthorne, Frank C.; et al. (2025) Ertlite, NaAl3Al6(Si4B2O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. \u003Ci>American Mineralogist\u003C\u002Fi>,  110 (12). 1865-1876 \u003Ca target='_blank' href='https:\u002F\u002Fdoi.org\u002F10.2138\u002Fam-2025-9816'>doi:10.2138\u002Fam-2025-9816\u003C\u002Fa>","10.2138\u002Fam-2025-9816",[],[],[347,348],"Ertliet","IMA2023-086",[350,354],{"lang":351,"names":352},"ca",[353],"ertlita",{"lang":355,"names":356},"de",[357],"Ertlit","Q127378023",{"history":6,"applications":6}]