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Staurotide twinned crystals in Maltese cross on a micaschist matrix. Three other staurotide crystals are present on the same piece, two on the back._x000D_ Staurotides on matrix are rarer than the isolated crystals because of the ease of erosion of the micaschist compared to the hardness of the staurotide.
9 x 5 x 2 cm.
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