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Chapter 2

Concept #7 Quiz

Concept #7 Quiz
Choose the best possible answer to the following questions about Key Concept 7 "Non-silicate minerals."

This activity contains 4 questions.

	Why are the non-silicate minerals subdivided into classes based upon anion or anion complex that the members have in common?   Minerals in each class have similar properties. Minerals in each class have similar properties to those of silicate minerals. Non-silicate minerals are grouped by electronegativity. Non-silicate minerals are commonly grouped by luster.

	Non-silicate minerals (including gold and pyrite) make up only about 8% of the crust. However, they tend to be economically important minerals. Which of the following is not a reason why these minerals are economically important?   These minerals are used in the manufacture of household electronics. A high proportion can be found in sedimentary rock regions. May be found in concentrated form as “deposits” that are mined. These minerals are widespread in the crust, but occur mostly in sedimentary rocks.

	What is the special property that allows one to identify calcite versus dolomite, the very similar carbonate minerals?   Calcite has three planes of cleavage at 60 and 120 degrees, whereas dolomite has three planes of cleavage at 90 degrees. Calcite has three planes of cleavage at 60 and 120 degrees, whereas dolomite has two planes of cleavage at 60 and 120 degrees. Calcite effervesces (fizzes) readily when HCl is applied. Dolomite effervesces (fizzes) readily when HCl is applied.

	What likely environment is implied by the presence of halite or gypsum in a sedimentary rock terrain?   A cooled magma chamber. A volcano. An evaporated lake. A chemical weathering environment.

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