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Note for Engineering Geology - EG By Indrajit Indrajit

  • Engineering Geology - EG
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Sachikanta Nanda

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What is a Mineral? A naturally occurring, inorganic solid that has a definite chemical composition and/or crystal structure Sachikanta Nanda

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Formation & Composition • Minerals come from cooled magma • 2500 kinds of minerals; some are easy to find and others are rare. Sachikanta Nanda

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• Mineral Properties Each type of mineral has its own combination of properties that identify it. Some of the properties are Color Many minerals come in a wide variety of colors. Different minerals can be the same color. It is difficult to use just color to identify a mineral. Streak Streak is the color of a mineral in powdered form. You can see a mineral’s streak by rubbing a sample across an unglazed ceramic plate and observing the powder left behind. Sometimes a mineral’s streak is very different from the color of the sample. Hardness Hardness is the resistance of a mineral to scratching. Geologists use the Mohs' hardness scale to seriate and compare mineral hardness. Sachikanta Nanda

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