Real minerals and rocks.

What two physical properties would be most useful in distinguishing between quartz and orthoclase in a coarse-grained granite?

What two physical properties would be most useful in distinguishing between quartz and calcite in a rock?

What two physical properties would be most useful in distinguishing between hornblende and biotite?

What two physical properties would be most useful in distinguishing between hornblende and augite?

Name two minerals that olivine occurs in nature with:

Name four common rock types which contain quartz:

Name a rock where garnet may be a significant mineral:

Name two igneous rocks which commonly contain hornblende: