Feldspar in Ceramics Quiz
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Questions and Answers

What physical property of minerals is determined by marking unglazed porcelain or scratching with a knife and observing the powder color?

  • Iridescence
  • Lustre
  • Streak (correct)
  • Color
  • Which mineral group is known for its platy structure and perfect cleavage, often used in electrical insulation and heat resistance?

  • Mica group (correct)
  • Quartz
  • Hornblende
  • Augite
  • What element is NOT commonly found in minerals according to the text?

  • Potassium
  • Silicon
  • Calcium
  • Copper (correct)
  • Which physical property of minerals refers to the description of how much a mineral reflects light?

    <p>Lustre</p> Signup and view all the answers

    Which of the following minerals might exhibit iridescence, showing rainbow colors either in the interior or on the surface?

    <p>Quartz</p> Signup and view all the answers

    In terms of physical properties, which mineral group is more likely to have a shiny, metallic lustre?

    <p>Augite</p> Signup and view all the answers

    What is the crystal system of quartz?

    <p>Hexagonal</p> Signup and view all the answers

    What is the chemical formula of Plagioclase?

    <p>NaAlSi3O8</p> Signup and view all the answers

    What is the cleavage of quartz?

    <p>Indistinct</p> Signup and view all the answers

    Which mineral family does quartz belong to?

    <p>Feldspar family</p> Signup and view all the answers

    What is the color of pure quartz?

    <p>Colorless</p> Signup and view all the answers

    What is the physical property of quartz related to hardness?

    <p>7</p> Signup and view all the answers

    In which type of rocks is quartz mostly found?

    <p>Igneous and metamorphic rocks</p> Signup and view all the answers

    What is the crystal system of pyroxene Augite?

    <p>Monoclinic</p> Signup and view all the answers

    Which mineral has a color range from dark green to brown and a hexagonal habit?

    <p>Hornblende</p> Signup and view all the answers

    What is the specific gravity range of Orthoclase?

    <p>2.6 - 2.8</p> Signup and view all the answers

    Which mineral has a good (prismatic) cleavage and a color that is greyish green and black?

    <p>Pyroxene Augite</p> Signup and view all the answers

    What is the chemical composition of the Mica Biotite group?

    <p>(K (Mg, Fe)3(Al Si3) O10(F, OH)2</p> Signup and view all the answers

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