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12. Another colorless chunk is found. It cannot be scratched by calcite. It has no shine to it, and seems to break apart in many directions. What is this mineral? 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?

12. Another colorless chunk is found. It cannot be scratched by calcite. It has no shine to it, and seems to break apart in many directions. What is this mineral? 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?

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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### Mineral Identification Tasks 12. **Colorless Chunk** - Description: Found mineral cannot be scratched by calcite. It lacks shine and fractures in multiple directions. - Question: What is this mineral? 13. **Hexagonal Crystal Mineral** - Description: A multicolored mineral, some almost clear, with hexagonal crystals. Hard enough to be scratched with a steel file. - Question: What is it? 14. **Deep Red Mineral** - Description: Gem-like appearance with a deep red color, leaving a colorless streak. Harder than quartz. - Suggestion: Could it be garnet? 15. **Unknown Mineral with Brown Streak** - Description: Leaves a brown streak and has an irregular fracture. Scratchable by a steel file but not a knife. Nonmetallic luster. - Question: What might it be? 16. **Whitish Mineral with Glow** - Description: Glows under ultraviolet light, leaves a colorless streak, cannot be scratched by a penny but can be scratched by a knife. - Question: What is it we are excited about? 17. **Blue Gem in Jewelry** - Description: Blue gem with a colorless streak that cannot be scratched by available tools but scratches quartz. - Question: What might it be? 18. **Coppery-Red Mineral** - Description: Suspected copper with a metallic luster, scratches fluorite. - Question: Is this copper? 19. **Black Mineral** - Description: Black mineral with a metallic luster leaving a black streak. Cannot be scratched by a fingernail, knife, or penny. - Question: Is it galena? 20. **Yellow Gem** - Description: Instructor finds a yellow gem believed to be topaz. - Question: If it is topaz, will it scratch a steel file?
Transcribed Image Text:### Mineral Identification Tasks 12. **Colorless Chunk** - Description: Found mineral cannot be scratched by calcite. It lacks shine and fractures in multiple directions. - Question: What is this mineral? 13. **Hexagonal Crystal Mineral** - Description: A multicolored mineral, some almost clear, with hexagonal crystals. Hard enough to be scratched with a steel file. - Question: What is it? 14. **Deep Red Mineral** - Description: Gem-like appearance with a deep red color, leaving a colorless streak. Harder than quartz. - Suggestion: Could it be garnet? 15. **Unknown Mineral with Brown Streak** - Description: Leaves a brown streak and has an irregular fracture. Scratchable by a steel file but not a knife. Nonmetallic luster. - Question: What might it be? 16. **Whitish Mineral with Glow** - Description: Glows under ultraviolet light, leaves a colorless streak, cannot be scratched by a penny but can be scratched by a knife. - Question: What is it we are excited about? 17. **Blue Gem in Jewelry** - Description: Blue gem with a colorless streak that cannot be scratched by available tools but scratches quartz. - Question: What might it be? 18. **Coppery-Red Mineral** - Description: Suspected copper with a metallic luster, scratches fluorite. - Question: Is this copper? 19. **Black Mineral** - Description: Black mineral with a metallic luster leaving a black streak. Cannot be scratched by a fingernail, knife, or penny. - Question: Is it galena? 20. **Yellow Gem** - Description: Instructor finds a yellow gem believed to be topaz. - Question: If it is topaz, will it scratch a steel file?
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