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Shortite: Na2Ca2(CO3)3
Comments: Colorless crystal of shortite on matrix. Location: Green River Formation, Sweetwater Co., Wyoming, USA. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Comments: Triangular shortite crystal in kerogenaceous dolomitic marlstone from the saline zone in the Green River Formation. Location: Green River, Sweetwater Co., Wyoming, USA. Scale: Crystal Size 2 mm. © Tom Loomis / Dakota Matrix