Question : Talc and graphite are two of the lowest minerals on the hardness scale. They are also described : 2141747
ESSAY. Write your answer in the space provided or on a separate sheet of paper.
112) Talc and graphite are two of the lowest minerals on the hardness scale. They are also described by terms like greasy or soapy. Both have a crystal structure characterized by sheet-structures at the atomic level, yet they don't behave like micas. What accounts for their unusual physical properties?
113) There are people who specialize in "cutting" diamonds, yet diamond is the hardest known substance. From your knowledge of minerals, which of the following describes what the diamond cutter does?
114) Gold is one of the rarest elements in the universe, yet it is extracted from ores on Earth. How is this possible?
115) Joe Geologist discovers a vein made up primarily of quartz but also containing significant amounts of pyrite as well as chalcopyrite. He knows better than to fall for fool's gold, and decides to ignore the vein. Did he make the right decision? Explain.