9 some scientists actually consider the exosphere as part of outer space as there is such a gradual and fuzzy distinction between the density of molecules in the very upper reaches of the atmosphere and lower reaches of space
Notice that graphite, commonly seen in pencil lead, and diamonds. have the same chemical formula. Minerals with the same chemical formula but. different crystal structures are called polymorphs. These minerals have different. types of chemical bonds and, thus, different crystal forms. If a substance fails any part of this definition, it is not a mineral. For example, table sugar, an organic compound formed by biological plant activity, fits all. facets of the definition except the inorganic part.
All of the over 4,000 known minerals, each falls into only one of six different crystal systems. Image right: These minerals are all in the garnet group; they are different chemical compositions but the same structure or examples of isomorphism. Image taken at Smithsonian; photo by S.W. Aber 2009.