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Practice Test
  1.All minerals are __________.  
  a.   made in a lab  
  b.   naturally occurring  
  c.   organic solids  
  d.   unordered  
  2.Large crystals can form when magma __________.  
  a.   erupts from a volcano  
  b.   melts  
  c.   cools slowly  
  d.   cools quickly  
  3.Titanium is useful because it has __________.  
  a.   a low Mohs number  
  b.   a low density and high durability  
  c.   a high density and low durability  
  d.   a colorless streak  
  4.Streak measures the color of a mineral's __________.  
  a.   powder  
  b.   crystals  
  c.   surface  
  d.   atoms  
  5.__________ is a solid in which the atoms are arranged in closely repeating patterns.  
  a.   A mineral  
  b.   An element  
  c.   A crystal  
  d.   An ore  
  6.Glass is not a crystal because __________.  
  a.   it is not crystalline  
  b.   it fractures  
  c.   it is transparent  
  d.   it is a solid  
  7.Which is an example of a mineral with a nonmetallic luster?  
  a.   gold  
  b.   graphite  
  c.   pyrite  
  d.   quartz  
  8.Where do most useful minerals occur in nature?  
  a.   in volcanoes  
  b.   in freshwater  
  c.   in ores  
  d.   in seawater  
  9.The Hope diamond, which is now at the Smithsonian, is said to __________.  
  a.   bring its owner good fortune  
  b.   bring its owner bad luck  
  c.   be one of the smallest diamonds in the world  
  d.   be an impure diamond  
  10.The hardest mineral, with a 10 on the Mohs scale, is __________.  
  a.   iron  
  b.   diamond  
  c.   talc  
  d.   quartz  
  11.Whether a mineral has cleavage or fracture is determined by the __________.  
  a.   shape of its surface  
  b.   specific gravity  
  c.   hardness of the mineral  
  d.   arrangement of its atoms  
  12.What are the two most common elements in minerals?  
  a.   oxygen and sulfur  
  b.   oxygen and silicon  
  c.   carbon and silicon  
  d.   iron and oxygen  
  13.You find a red gemstone that is from Sri Lanka. What gem is this most likely?  
  a.   ruby spinel  
  b.   emerald  
  c.   sapphire  
  d.   topaz  
  14.Common physical properties of minerals include all of the following except __________.  
  a.   appearance  
  b.   flammability  
  c.   hardness  
  d.   specific gravity  
  15.The specific gravity of a mineral compares its weight with an equal volume of __________.  
  a.   water  
  b.   diamond  
  c.   rock  
  d.   air  
  16.Amethyst is a variation of which mineral?  
  a.   topaz  
  b.   quartz  
  c.   garnet  
  d.   diamond  
  17.A mineral that is hard __________.  
  a.   will not break  
  b.   can be scratched with your fingernail  
  c.   is hard to scratch  
  d.   will not shatter  
  18.Some gems have __________.  
  a.   a low Mohs number  
  b.   fracture  
  c.   a crystalline structure  
  d.   no color  
  19.Why are gems valuable?  
  a.   They are hard.  
  b.   They are crystals.  
  c.   They are rare.  
  d.   They are minerals.  
  20.Which is an industrial use of diamonds?  
  a.   in watches  
  b.   in lasers  
  c.   as cutting tools  
  d.   in jewelry  

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