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Pleonaste is an intermediate member of the spinel-hercynite series; it is basically iron-rich spinel. This is a great older specimen from my personal collection. The dark blue crystals measure to 5 mm and are undamaged. For more information on pleonaste, see the Mindat species page. Comes with a label from Schortmann's minerals. 5.4 x 4.5 x 4.5 cm.
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