I n]have to find four crystalline substances and i found diamonds, salt and sugar can you guys give me two more. the reason why two is because I don't have diamonds to take to the classroom.

Question

Look at your earrings...fake diamonds, are crystalline, unless glass.

Salt, sugar many forms, honey crystals if you can see them in the jar, quartz if you have a piece at home, or you can point to your teachers diamond and count it.