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Walkerite: Ca16(Mg,Li,[ ])2[B13O17(OH)12]4Cl6·28(H2O)
Comments: Scanning electron micrograph of an acicular walkerite crystal. Location: Potash Corporation of Saskatchewan (New Brunswick Division) mine at Penobsquis, near Sussex, Kings County, New Brunswick, Canada. Scale: See Picture. © Canadian Mineralogist