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Mineral contains: Johnwalkite
Dunn P J, Peacor D R, Sturman D B, Ramik R A, Roberts W L, Nelen J A (1986) Johnwalkite, the Mn-analogue of olmsteadite, from South Dakota. Neues Jahrbuch für Mineralogie, Monatshefte 1986, 115-120
Hawthorne F C, Bladh K W, Burke E A J, Grew E S, Langley R H, Puciewicz J, Roberts A C, Schedler R A, Shigley J E, Vanko D A (1987) New mineral names. American Mineralogist 72, 222-230