Ettringite with Calcite

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A choice and highly aesthetic specimen with two hexagonal, acidic lemon-yellow Ettringite crystals to 1.7 and 1.8 cm long, perched either end of a well crystallised group of Calcite crystals. Ettringite is a hydrous calcium aluminium sulphate and the crystals on this miniature grade from translucent outer shells with a glassy to satin lustre, to inner, opaque pale lemon-white cores. The slightly longer crystal has no terminations whereas the smaller has one well terminated end. A classic Ettringite from the N'Chwaning mines at Kuruman in the Kalahari Manganese Field of Northern Cape Province, South Africa.