Mock Rocks Part 2

We cracked open our mock rocks and separated them into all the different components. There were three “minerals” we could see in our rocks . . . represented by red gravel, green gravel and oyster shells. The rest of the rock (white matter with sparkles!) was dissolved in water. Tomorrow we will decide whether or not this material contains any more minerals. Hmmm . . . how could we find out what might be dissolved in the water?