Problems with dating metamorphic rocks


Over 90% of the Earth's crust is made up of silicates.The rest of the minerals are lumped into a group called non-silicates.

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Silicates are minerals that contain silicon and oxygen.Instead, it is a rock composed of multiple minerals.The blue color of lapis lazuli is mainly derived from the presence of lazurite, a blue silicate mineral of the sodalite group with a chemical composition of (Na, Ca) Lapis Lazuli - The Rock: This photo shows a specimen of marble in which small patches of lazurite and abundant crystals of pyrite have formed.Thus, scientists divide igneous rocks into two different categories: Those which cooled below the surface, and those that cooled on the surface.Those which began their lives below the surface are called intrusive rocks, while those which cooled on the surface are referred to as extrusive rocks.Minerals have a specific chemical structure which is the same throughout the entire mineral.

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