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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Directed Reading A Section: Identifying Minerals COLOR 1. Why is color not the best physical property to use to identify a mineral? ______________________________________________________________________ ______________________________________________________________________ LUSTER 2. The way a surface reflects light is called ______________________. 3. What are the three types of mineral luster and what does each mean? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ STREAK 4. The color of a mineral in powdered form is called the mineral’s ______________________ 5. Why is using a mineral’s streak more reliable than using color to identify a mineral? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ CLEAVAGE AND FRACTURE 6. Name two minerals with cleavage, a tendency to break along smooth, flat surfaces. ____________________________________________________________________ ____________________________________________________________________ 7. The tendency of some minerals to break unevenly along curved or irregular surfaces is called ______________________. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 3 Minerals of the Earth’s Crust Name ______________________________ Class ___________________ Date __________________ Directed Reading A continued HARDNESS _____ 8. A mineral’s resistance to being scratched is called a. weight. c. luster. b. streak. d. hardness. 9. What do scientists use to determine the hardness of minerals? ____________________________________________________________________ ____________________________________________________________________ 10. What is the softest mineral on the Mohs scale? ____________________________________________________________________ SPECIAL PROPERTIES 11. The special property of calcite and fluorite that causes them to glow under ultraviolet light is called______________________. 12. A special property of magnetite is that it is a natural _____________________that attracts iron. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 4 Minerals of the Earth’s Crust
