World of Crystals

Crystals are made of tiny particles called molecules that join together in a unique, repeating pattern. 

Different types of crystals are made from different materials, like salt, sugar, or rock minerals. 

Shape of Crystals:

  • Crystals have different shapes because their molecules line up uniquely.
  • Molecule lineup is determined by the type of material and the conditions in which the crystal forms, such as
    • Temperature
    • How quickly the crystal grows.
  • Salt crystals often form cube shapes, while quartz crystals are long, six-sided prisms.

Growing Crystals At Home

We can grow crystals using kitchen ingredients such as salt, sugar, and baking soda. 

Materials Needed for Sugar Crystals:

  • Sugar
  • Warm water
  • A jar
  • A piece of string
  • A pencil or popsicle stick
  • Food Coloring


  1. Fill the jar with warm water.
  2. Dissolve sugar in warm water until no more will dissolve. Add food coloring for colorful crystals.
  3. Tie a piece of string to a pencil or popsicle stick and balance it on top of the jar so the string hangs down into the solution.
  4. Leave the jar in a place where it won’t be disturbed.
  5. After a week or so, you’ll see sugar crystals growing on the string.

Fun Facts

Here are some interesting facts about crystals:

  • The largest natural crystals ever found are selenite crystals in Mexico’s Naica Mine, some of which are over 30 feet long!
  • Rock candy is made of sugar crystals you can grow and eat.
  • Many precious gemstones, like diamonds, rubies, and emeralds, are actually crystals formed deep inside the Earth.
  • Crystals aren’t just in rocks and jewelry—they’re also found in snowflakes, computer screens, and even our bodies (like in bones and teeth)!


Let’s quickly recap what we learned about crystals:

  • What tiny particles are crystals made of? Molecules
  • How are the tiny particles in crystals joined? Unique, Repeating Patterns
  • Which three materials found in the kitchen can be used to grow crystals? Salt, Sugar, Baking Soda
  • What is the shape of quartz crystals? Six-sided Prisms
  • What is the most common shape of salt crystals? Cube
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