Things needed:
A glass jar 9 inches tall. Clean water. A cup of cooking salt. A spoon for stirring. A one-and-a-half-foot cotton string, the type used in underwear. Scissors. 2 toothpicks.
What to do:
Fill the jar with water. Add the salt to the water little by little, stir till the water stops dissolving the salt. Now you have a saturated salt solution. Tie each end of the string to a toothpick.
Place the string over the top of the jar so that the string dangles into the middle of the solution and the toothpicks hang over the edge.
Results:
Wait for the salt crystals to form along the string.
These are excellent examples of cubic crystals. Put them under a microscope.
Record:
Are they formed in perfect shapes? What shape are they? What colour? Can you see any micro-organisms on the crystals?
Observation:
Crystals can be found in clusters of small ones or as huge individual ones. They vary in size from tiny ones to pretty large ones. Dry salt crystals can be stored in bottles for long periods.
To do:
Collect crystals of varying sizes, label the different types and make a rock collection box to keep them in.
Picture Credit : Google
