Tales From the Shale Posted March 12, 2023 Share Posted March 12, 2023 A sizeable mineral coming from the ever famous Graf roadcut that exposes the Elgin of the Maquoketa. Im thinking calcite, but im gonna be honest I haven't a clue. 2 Link to comment Share on other sites More sharing options...
Coco Posted March 12, 2023 Share Posted March 12, 2023 Hi, I’m thinking more quartz if I’m looking at the sparkle and the break. Put a little vinegar in the corner. If it sparkles, it’s calcite (and you have to rinse it well). If it doesn’t sparkle, it’s quartz. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
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