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13. We find a large amount of a mineral that has various colors. Some of it is almost clear. It appears to have hexagonal crystals and is hard enough to be scratched with a steel file. What is it?

13. We find a large amount of a mineral that has various colors. Some of it is almost clear. It appears to have hexagonal crystals and is hard enough to be scratched with a steel file. What is it?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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13. We find a large amount of a mineral that has various colors. Some of it is almost clear. It appears to have hexagonal crystals and is hard enough to be scratched with a steel file. What is it? 14. This is a deep red mineral that looks like a gem. It leaves a colorless streak and is harder than quartz. Could it be garnet? 15. This unknown mineral leaves a brown streak and fractures irregularly. It can be scratched with a steel file but not by a knife. It has nonmetallic luster. What might it be? 16. The class gets excited when we find a whitish mineral that glows when put under ultraviolet light. It leaves a colorless streak and cannot be scratched by a penny, but can be scratched with a knife. What is it we are so excited about? 17. You are examining a gem that you find in a piece of jewelery. It is blue, leaves a colorless streak. It cannot be scratched by anything you find. It does scratch quartz. What might it be? 18. We believe we may have found some copper. The mineral looks coppery-red and can be scratched by flourite. It has a metallic luster. Is this copper? 19. Another black mineral is found by students. It leaves a black streak and has a metallic luster. It cannot be scratched by a fingernail, knife, or penny. Is it galena? 20. A yellow gem that the instructor picks up seems to be topaz. If it is, will it scratch a steel file?
Transcribed Image Text:13. We find a large amount of a mineral that has various colors. Some of it is almost clear. It appears to have hexagonal crystals and is hard enough to be scratched with a steel file. What is it? 14. This is a deep red mineral that looks like a gem. It leaves a colorless streak and is harder than quartz. Could it be garnet? 15. This unknown mineral leaves a brown streak and fractures irregularly. It can be scratched with a steel file but not by a knife. It has nonmetallic luster. What might it be? 16. The class gets excited when we find a whitish mineral that glows when put under ultraviolet light. It leaves a colorless streak and cannot be scratched by a penny, but can be scratched with a knife. What is it we are so excited about? 17. You are examining a gem that you find in a piece of jewelery. It is blue, leaves a colorless streak. It cannot be scratched by anything you find. It does scratch quartz. What might it be? 18. We believe we may have found some copper. The mineral looks coppery-red and can be scratched by flourite. It has a metallic luster. Is this copper? 19. Another black mineral is found by students. It leaves a black streak and has a metallic luster. It cannot be scratched by a fingernail, knife, or penny. Is it galena? 20. A yellow gem that the instructor picks up seems to be topaz. If it is, will it scratch a steel file?
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