PROBLEM: Are all types of commercially used salt (halite), cubic?

PREDICTION:

PROCEDURE: You have 6 samples of salt from the Cargill Salt Company in Newark, California. They commercially produce salt for food, animals, and water conditioning.

Look at the following examples of salt under a microscope. Draw the shapes you see. State what commercial purpose you think each type may have.

CONCLUSION: Which samples maintain the cubic shape? Why might some samples not have a cubic shape?