题目内容

How many cleavage/cleavages is/are the mica has/have?

A. 1
B. 2
C. 3
D. 4

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What is the tendency of a mineral to break along planes of weak bonding?

A. Fracture
B. Cleavage
C. Hardness
D. Luster

The degrees of transparency are:

A. Transparent
B. Translucent
C. Opaque

The appearance of being coated with an oily substance is called:

A. Vitreous luster
B. Adamantine luster
C. Greasy luster

Which element is the most abundant in the Earth (by weigh)?

A. Si
B. O
C. Al
D. Fe