PropertiesofMinerals

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1、Properties of MineralsGeologists use characteristics to tell one mineral from another1 1Mineral Properties we will studyLusterHardnessCleavageStreak2 2LusterRefers to the way light reflects from the surface of the mineral.There are two types of luster,Metallic:looks like polished metal.Nonmetallic:d

2、oes not look like polished metal.Nonmetallic can be shiny or dull.3 3Pyrite has metallic luster4 4Quartz has nonmetallic luster5 5HardnessIs measured by how easy it is to scratch.Geologists order the hardness by1.Scratched by a fingernail.2.Scratched by a penny.3.Scratched by a nail.4.Scratched by a

3、 diamond.These are not all of the tools geologists use,but it will work for our experiment.6 6Gypsum is soft,it can be scratched by a fingernail.7 7Calcite is soft,but a little harder because it cannot be scratched by a fingernail,but it can be scratched by a penny.8 8Fluorite is harder.It can be sc

4、ratched by a nail,but not a penny or fingernail.9 9Diamonds are the hardest mineral,so it scratches every mineral.1010CleavageNot all minerals have cleavage.Some minerals split easily along a flat surface.The number of lines that are created when a mineral is split will be the number of cleavage lin

5、es.1111Mica has cleavage in one direction.It breaks along one line.1212Feldspar has two lines of cleavage.It breaks along two lines.1313StreakRed chalk on a chalk board makes red marks.White chalk makes white marks.Not all minerals work this way.When some minerals are scratched along a ceramic strea

6、k plate,it creates a different color.1414GoldWhen gold is run across a streak plate it makes a yellowish-gold color.That makes sense.1515Pyrite or“Fools Gold”When pyrite is run across a streak plate,it has a black or dark green streak.Pyrite is not worth much money,while gold is worth a lot.They loo

7、k alike,so miners call it fools gold.1616HematiteHematites color is grey,but its streak is red.Hema means blood.The mineral was named hematite because it looked like it was bleeding when it was taken across a streak plate.1717One mineral property we will not useCOLOR1818A mineral can be many differe

8、nt colors.Below is Mica.1919Many minerals can be the same color.Below are Many minerals can be the same color.Below are gold colored minerals.Which one is gold?gold colored minerals.Which one is gold?2020The answerNone of them were real gold.2121Just like with peopleOutside color does not tell you much about the important characteristics.2222