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Exploring Mineral Properties Write the following in your Science notebook Moh’s Hardness Scale Determining a mineral’s hardness is an important part of mineral identification. If a mineral can be scratched by another mineral then it is not as hard as that mineral. Take a look at the minerals in the Scale of Hardness Box. Use these minerals to scratch the unknown mineral. Answer the following questions: 1. What is the hardness of the unknown mineral?_______________ 2. If this were one of the minerals in the box, which would it be?______________________________. 3. What is the softest mineral? __________________ 4. What is the hardest? ________________________ Fluorescent Minerals Fluorescence is a glow some minerals show when they are exposed to ultraviolet light. This occurs because of light interacting with electrons that are weakly held together because of impurities in the crystal structure of the mineral. Use the black light to help you answer the following: 5. What color does Opalite (#10) fluoresce? 6. What color does calcite (#9) fluoresce? Magnetism Can minerals be magnetic? Try to figure out which of these three black rocks is magnetic? Rock #_______________ Crystal Structure Use the microscope to look at the different crystal structure. Tell the structures of the following numbers: 9 and 12 using the chart supplied at the lab table. Pick one mineral out of the Washington mineral box and describe it in your notebook filling in the following information: Washington Mineral—Make the following chart Color Luster Hardness Streak Fluorescence Magnetic Crystal Fracture/ Density Mineral structure cleavage Name