Description: Cordierite, Mullite Ettringer Bellerberg (Bellberg; Bellenberg; Billenberg; Boilenberg), Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany 1.2 mm brown-orange Cordierite crystal with acycular purple Mullite crystals. Collection & Photo M.Chinellato

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