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More model informationGlendonites are a relatively common feature of the early Permian sedimentary rocks of the Sydney Basin. These examples occur in a glendonite-rich sandy mudstone layer in the Pebbley Beach Formation. The depositional environment was likely lower shoreface. Glendonites are an indicator of glacial conditions and grow in seawater at 2-4°C. They initially form as the precipitate ikaite (CaCO₃.6H₂O), which then is later pseudomorphed (usually by calcite). These examples are an unusually large bladed form with a rhombic cross sestion, and display prominent striations on the surface perpendicular to the c-axis. Ikaite is a monoclinic crystal but often forms pseudo-orthohombic prisms like these. Model reprocessed and updated 14/12/2021
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