Earth science 1.2 : Identifying minerals

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Earth science 1.2 : Identifying minerals

  1. 1. Identifying Mineral<br />Earth Science<br />Chapter 1.2<br />
  2. 2. Objectives:<br />Identify seven ways to determine the identity of minerals.<br />Explain special properties of minerals.<br />
  3. 3. Identifying Minerals<br />Use Properties<br />Color<br />Minerals display a wide variety of colors, and often the same mineral can be found in many different colors<br />usually not the best way to identify a mineral<br />*** All varieties of Quartz<br />
  4. 4. Luster<br />The way a mineral reflects light<br />Three types of mineral luster<br />Metallic – bright, reflective<br />Submetallic – dull, reflective<br />Nonmetallic - dull<br />Earthy<br />pearly<br />glassy<br />silky<br />resinous<br />waxy<br />
  5. 5. Streak<br />The color of a mineral in powdered form<br />Can be found by running the mineral against a piece of unglazed porcelain called a streak plate<br />color of a mineral’s streak is not always the same as the color of the mineral sample<br />Gold<br />Platinum<br />Copper<br />
  6. 6. Cleavage and Fracture<br />Different types of minerals break in different ways<br />Cleavage<br />Tendency of some minerals to break along smooth, flat surfaces<br />Fracture<br />Tendency of some minerals to break unevenly along curved or irregular surfaces<br />Examples of cleavage<br />Examples of fracture<br />
  7. 7. Hardness<br />Mineral’s resistance to being scratched<br />scientists use Mohs hardness scale<br />
  8. 8. Density<br />measure of how much matter is in a given amount of space<br />Density is a ratio of an object’s mass to its volume<br />Density = 5.1 g/cm3<br />Density = 19.3 g/cm3<br />Specific Gravity : Ratio of an objects density to the density of water <br />
  9. 9. Special Properties<br />Some properties are particular to only a few types of minerals<br />

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