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Epididymite: NaBeSi3O7(OH)
Comments: Trilling twinned crystal of epididymite on matrix. Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Epididymite: NaBeSi3O7(OH) Eudidymite: NaBeSi3O7(OH)
Comments: Translucent prismatic crystals of eudidymite on white opaque epididymite. Location: Narsaarsuk, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species