| | Journal (article/letter/editorial) | MICHIGAN GYPSUM With Emphasis on the Grand Rapids Gypsum Locality Figure 1 (left): Colorless and transparent...transparent selenite crystals on gray shale and yellow gypsum matrix. Largest crystals IVi inches in length....Colorless, transparent selenite crystals on pink gypsum matrix. Largest crystal 1 Vi inches in length....from Grand Rapids. MARY JANE DOCKERAY Blandford Nature Center 1715 Hillburn Avenue, N.W. Grand Rapids...Rapids, Michigan 49504 Not all salts of the sea are " s a l t y . " One of those deposited as inland seas | | | Book | Mineralogy of Michigan by E. W. Heinrich updated and revised • by George W. Robinson M By E W~ Hellnr]ch...Museum Michigan Technological University Houghton, Michigan 49931 2004 © MINERALOGY OF MICHIGAN 3 FOREWORD...FOREWORD Michigan has a long and varied geologic history that includes repeated episodes of volcanism...before the first Europeans set foot here. When Michigan became a state in 1837, one of the first actions...and we continue to learn more about them today. Michigan minerals helped to build the state and nation |
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Grand Rapids Gypsum Company Mine, Kent County, Michigan, USA