underthescopeminerals:Biotite Locality:In den Dellen quarries, Niedermendig, Mendig, Laach lake volc
underthescopeminerals:Biotite Locality:In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic complex, Eifel, Rhineland-Palatinate, GermanyBiotite crystals with fine growth structures in a vug of a sanidinite ejection block.Volker Betz’s Photo -- source link
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