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Boissejour quarry, France
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Hydrocalumite and afwillite, Boisséjour quarry, Puy-de-Dôme, France. Specimen 6x5.5x2.5cm covered with a mixture of hydrocalumite, a calcium aluminium hydroxide, and afwillite, a calcium hydroxy silicate. In a period cardboard tray with a handwritten label coll. Chadel.