51) Which of the following statements is not true? A) The only minerals in the l

Question

51) Which of the following statements is not true? A) The only minerals in the lab sets that will react with dilute hydrochloric acid are carbonates such as dolom and calcite B) Fluorite has three cleavage directions and may be white (clear), yellow, purple, or blue in color C) Magnetite is magnetic D) Olivine has an olive green streak color and a conchoidal fracture 52) The end of the Permian Period marks a great extinction event. This event occurred about years ago. A) 65 million B) 200 million C) 250 million D) 540 million hrittle nlates of nlate tectonics

Explanation / Answer

51) Ans - B

Fluorite has interesting cleavage habits. The perfect cleavage parallel to the octahedral faces can sometimes be peeled off to smooth out a crystal into a perfect octahedron. Many crystals, especially larger ones, have their edges or sections chipped off because of the cleavage.

52) 250 Years ago

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