Geologists use the Mohs scale to determine a mineral's hardness. Using the scale, a mineral with a higher rating will leave a scratch on a mineral with a lower rating. Geologists use scratch tests to help identify an unknown mineral.

a. Use the table to write three if-then statements such as "If talc is scratched against gypsum, then a scratch mark is left on the talc." 

b. The four minerals in the table are randomly labeled A, B, C, and D. You must identify them. The results of your scratch tests are shown below. What can you conclude? Explain your reasoning. 

Mineral A is scratched by  Mineral B. Mineral C is scratched by all three of the other minerals. 

c. What additional test(s) can you use to identify all the minerals in part (b)?

Transcribed Image Text:

Mineral Mohs rating Taic 1 Gypsum 2 Calcite 3 Fluorite 4