题目内容

Biotite is the common member of the mica family. It belongs to:

A. Light silicate
B. Dark silicate
C. Nonsilicate

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Muscovite is the common member of the mica family. It belongs to:

A. Light silicate
B. Dark silicate
C. Nonsilicate

Which mineral is the second-most abundant mineral in the continental crust and the only common mineral made completely of silicon and oxygen?

A. Feldspar
B. Calcite
C. Silicon dixiode
D. Mica

Smoky quartz is the quartz contains trace amounts of:

Al
B. Fe
Ca
D. Mg

The silicate minerals are the most common type of minerals. What's the percentages do they account for of Earth's crust?

A. Less than 50%
B. About 50%
C. More than 90%
D. Less than 10%