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1. You come across a mineral that scratches quartz. Could it be gypsum?

1. You come across a mineral that scratches quartz. Could it be gypsum?

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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1. You come across a mineral that scratches quartz. Could it be gypsum? 2. The class finds a handful of pale yellow, shiny nuggets. The mineral leaves a greenish-black streak, and cannot be scratched by fluorite. Have we struck it rich? 3. You find a handful of whitish gray stones with a non-metallic luster that leaves a colorless streak. They can be scratched with a steel file but not with a knife. What do you have? 4. This one is a red mineral which leaves a gray streak. It can be scratched with a fingernail and with a penny, and can be easily cut with a knife. What is it? 5. This is a very soft mineral that leaves black “grease” on your fingers. It makes a black streak and has shiny luster. What is it? 6. Another mineral is metallic and gray in color. It leaves a gray streak. The crystals appear cubic. When it breaks, it breaks with clear, clean cleavage. It scratches gypsum. Is it graphite? 7. The class is looking at a pile of white, non-metallic stones that leave a white streak. They can be scratched with a fingernail. What are we looking at? 8. This one is composed of yellow stones that leave a yellow streak. They can be scratched with a fingernail. Could it be gold? But it doesn’t have a metallic luster. What could it be? 9. A pale white stone is found at your feet. It has hexagonal crystals, leaves a white streak, and can be scratched with a knife, but not by a fingernail. Could it be dolomite? 10. This mineral feels soapy and leaves behind a white residue. It is very soft and flakes off. What is this mineral? 11. A student in class finds a colorless chunk that breaks apart into cubes. It has vitreous luster and is soft enough to be scratched by fluorite. When the student gets it wet, it starts to dissolve. What is it?
Transcribed Image Text:1. You come across a mineral that scratches quartz. Could it be gypsum? 2. The class finds a handful of pale yellow, shiny nuggets. The mineral leaves a greenish-black streak, and cannot be scratched by fluorite. Have we struck it rich? 3. You find a handful of whitish gray stones with a non-metallic luster that leaves a colorless streak. They can be scratched with a steel file but not with a knife. What do you have? 4. This one is a red mineral which leaves a gray streak. It can be scratched with a fingernail and with a penny, and can be easily cut with a knife. What is it? 5. This is a very soft mineral that leaves black “grease” on your fingers. It makes a black streak and has shiny luster. What is it? 6. Another mineral is metallic and gray in color. It leaves a gray streak. The crystals appear cubic. When it breaks, it breaks with clear, clean cleavage. It scratches gypsum. Is it graphite? 7. The class is looking at a pile of white, non-metallic stones that leave a white streak. They can be scratched with a fingernail. What are we looking at? 8. This one is composed of yellow stones that leave a yellow streak. They can be scratched with a fingernail. Could it be gold? But it doesn’t have a metallic luster. What could it be? 9. A pale white stone is found at your feet. It has hexagonal crystals, leaves a white streak, and can be scratched with a knife, but not by a fingernail. Could it be dolomite? 10. This mineral feels soapy and leaves behind a white residue. It is very soft and flakes off. What is this mineral? 11. A student in class finds a colorless chunk that breaks apart into cubes. It has vitreous luster and is soft enough to be scratched by fluorite. When the student gets it wet, it starts to dissolve. What is it?
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