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Bisköpsaker, Abo, Finland
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Bonsdorffite, Bisköpsaker, Turku, Finland. In a siliceous matrix measuring 7x4x4 cm, several crystals of bonsdorffite (or bunsdorfite, the former name for cordierite), which belongs to the tectosilicate group and is a magnesium and iron aluminosilicate. Three historic handwritten labels: Deyrolle, J. Chervet and the Marquis de Mauroy