For sale is a glendonite from Glendon, NSW. Glendonite is an unusual and distinctive form of calcite (CaCO3). Glendonites started out life as crystalline masses of ikaite, a hydrous calcium carbonate mineral (CaCO3·6H2O). Ikaite only forms in near-freezing water (~0º to 7º C) of high alkalinity, in organic-rich sediments at the sediment-water interface. At warmer temperatures, ikaite is not stable, and the mineral loses its water content. It converts to calcite.
GLENDON, HUNTER VALLEY, NSW.
62 x 40 x 17mm.