Ankerite, Cookeite And Quartz From Pulaski Co, Arkansas- Collectors Piece Crystal Selenite On Matrix From The

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Ankerite, Cookeite And Quartz From Pulaski Co, Arkansas- Collectors Piece Crystal Selenite On Matrix From TheAnkerite, Cookeite And Quartz From Pulaski Co, Arkansas Collectors Piece Weight 35gSize 3cm by 3. 5cm Thickness 2. 5cm Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates. Cookeite (pronounced Cook ite) is an uncommon member of the Chlorite group, and is best known for its occurrence in granite pegmatites associated with Tourmaline, where it often forms as a growth layer upon the Tourmaline.