𝙊𝙥𝙩𝙞𝙘𝙨, 𝙘𝙝𝙚𝙢𝙞𝙨𝙩𝙧𝙮 𝙖𝙣𝙙 𝙤𝙘𝙘𝙪𝙧𝙧𝙚𝙣𝙘𝙚 𝙤𝙛 𝙧𝙤𝙘𝙠-𝙛𝙤𝙧𝙢𝙞𝙣𝙜 𝙢𝙞𝙣𝙚𝙧𝙖𝙡𝙨
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The purpose of petrology is to understand the conditions of the formation of rocks. The first stage of this approach is to describe and classify the rocks; that is the subject of petrography. Many characters can be used: density, hardness, colour, structure (on the scale of the outcrop), texture (on the scale of the sample or of the microscope), mineralogical composition, chemical composition, speed of propagation of the waves, etc.
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