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.
Note also that the minerals as used in the nutritional sense are not minerals as defined geologically. Examples. 1  Glass-can be naturally formed (volcanic glass called obsidian), is a solid, its chemical composition, however, is not always the same, and it does not have a crystalline structure. mineral is. 1  Naturally formed-it forms in nature on its own (some say without the aid of humans]. 2  Solid (it cannot be a liquid or a gas). 3  With a definite chemical composition (every time we see the same mineral it has the same chemical composition that can be expressed by a chemical formula).