GEOLOGY

Detailed explanation-1: -One commonly used example of this are the minerals diamond and graphite. Both consist entirely of atoms of carbon, and so have exactly the same chemical formula, but graphite has a hexagonal crystal system and diamond has a tetrahedral crystal system; as a result their physical properties are very different.

Detailed explanation-2: -Two minerals that have the same chemical composition but different crystal lattice structures are called polymorphs.

Detailed explanation-3: -Different minerals with different compositions can have the same crystal structure. For instance, calcite CaCO3 has the same structure as rhodochrosite MnCO3. We say that these minerals are isostructural.

Detailed explanation-4: -Silicates are the largest mineral group. About 1, 000 silicate minerals are known. Silicate minerals are also extremely common. They make up over 90% of Earth’s crust!