This ankerite is from Hiddenite in Alexander County, North Carolina, USA. This area contains several mines that are operated for the recovery of emerald, hiddenite and other mineral specimens including ankerite. It is a carbonate and it contains the elements Ca, Fe, Mg, C, and O. This specimen consists of several sharp rhombic crystals that have attached limonite and mica matrix. This piece measures 1 9/16 x 1 x 1 inches or 39 x 16 x 25 mm.