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An atomic arrangement in which two single chains of silica tetrahedra bond together by sharing the third oxygen in alternate tetrahedra. Feldspar group A group of silicate minerals in which silica tetrahedra are arranged in a framework structure and containing potassium, calcium or sodium cations.
The zinc atoms have a coordination number equal to 4 (s p 3-hybrid state, tetrahedral environment with four sulfur atoms) in the bulk of sphalerite, while in galena, the lead atoms are characterized by a coordination number equal to 6 (s p 3 d 2-hybrid state, octahedral environment of six sulfur atoms).