1. Structures for SiO 3 2– , Si 4 O 11 6– , and SiO x
  2. A Geological Periodic Chart
  3. Word Search

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Words about concepts in this module can be obtained from the clues given. Find these words in the block of letters:

  1. Silicates are compounds made primarily of oxygen and this element.
  2. A gem whose basic mineral is Al 2 O 3 with Cr (III) as an impurity.
  3. This property of gemstones is characterized by presence of transition elements as impurities.
  4. This gemstone is an allotrope of carbon.
  5. Most abundant element in the earth’s crust, by mass.
  6. Inorganic solid of definite composition found in the crust.
  7. Silicates have this geometrical arrangement.
  8. Rock candy is this organic compound.
  9. One of the six basic crystal systems.
  10. A lavender flame test identifies this element.