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Minerals Classification Terms ( cont )

Minerals Classification Terms ( cont ). Fracture terms. Conchoidal – F racture is a smooth curve, bowl-shaped Hackly – F racture has sharp, jagged edges Uneven – Fracture is rough and irregular Fibrous – Fracture surface shows fibers or splinters. Cleavage .

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Minerals Classification Terms ( cont )

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  1. Minerals Classification Terms (cont)

  2. Fracture terms • Conchoidal –Fracture is a smooth curve, bowl-shaped • Hackly –Fracture has sharp, jagged edges • Uneven –Fracture is rough and irregular • Fibrous –Fracture surface shows fibers or splinters

  3. Cleavage • A mineral that splits easily along a flat surface has a property called cleavage (ex. Mica)

  4. Cleavage Terms: • Perfect- produces smooth surfaces (often seen as parallel sets of straight lines) ex. Mica • Imperfect –produces planes that are not smooth ex. pyroxene • Non-existent –no cleavage

  5. Perfect Cleavage (Mica)

  6. Imperfect (breaks along a plane but not smoothly) (Pyroxene)

  7. No Cleavage –does not break along a plane --it only fractures (breaks irregularly) (Quartz)

  8. Kyanite

  9. Kyanite –Example Mineral Identification Color: blue/blue grey Hardness(on Moh’s Hardness scale): 4.5 Streak: white Luster: greasy, pearly Cleavage: Perfect Fracture: Fibrous

  10. Answer the following questions (10 points) • What are the 5 characteristics that all minerals must have? • What does it mean to say that a mineral is inorganic? • Amber is a precious material in jewelry. It forms when the resin of pine trees hardens into stone. Is amber a mineral? Explain. • Name as many properties as you can think of that can be used to identify minerals. • What is the difference between fracture and cleavage?

  11. Look at the Mineral on your table: • Answer the following questions about your mineral: • 1) What is its color • 2) Does it reflect light? • 3) Is it heavy or light? • 4) How hard is it? If you try to scratch it with your fingernail, does it leave a mark? • 5) How does the mineral break? • 6) Does the mineral have any other unique properties?

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