Читать книгу Introduction to Ore-Forming Processes - Laurence Robb - Страница 19

Both metals and non‐metals exist in nature in the native form, where essentially only one element exists in the structure. Metals occurring in the native form include copper, silver, gold, and platinum which are all characterized by cubic close packing of atoms, high densities, and are malleable and soft. The carbon atoms in diamond are linked in tetrahedral groups forming well cleaved, very hard, translucent crystals. Sulfur also occurs as rings of eight atoms and forms bipyramids or is amorphous.