This is a culminating activity once students (upper elementary to early middle school) have completed other lessons/activities revolved around identifying minerals when looking at their various traits (luster, color, streak, hardness, etc.). This activity features a series of different "suspects" who are called into question for a recent dog-napping. Students will read through all six suspects to fill out the suspect sheet. Then after reading through the six clues (teacher can choose how students will receive them), students will use their skills in investigation, critical thinking, and mineral identification to determine the true culprit.
While the activity could be modified to be done without the six minerals, this really only makes sense to use if you have minerals (specifically talc, calcite, pyrite, magnetitie, rose quartz, and mica) on hand. If you have most of these minerals but not all, you could modify the activity to fit your supplies.