题目内容

The feldspars group belong to:

A. Light silicate
B. Dark silicate

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Ways of how minerals formed.

A. Precipitation of Mineral Matter
B. Crystallization of Molten Rock
C. Deposition as a Result of Biological Process

The most common mechanical properties we used to identify the minerals are:

A. color
B. cleavage
C. transparency
D. hardness
E. fracture
F. luster

This phenomena is the characteristic of two or more crystalline substances to have similar chemical composition, axial rations and crystal forms, and to crystallize in the same crystal class, such as olivine in which Mg and Fe take the same positions in crystal structure. What is the phenomena described by the above paragraph?

A. Polymorphism
B. Isomorphism

What kind of phenomena is the following expression described. It is the characteristic of a chemical substance to crystallize in more than one form under different conditions, such as graphite and diamond. Both graphite and diamond are composed of carbon, but they have different crystal structures and thus have different characteristics. For example, graphite has layer structures and thus is very soft, while diamond has framework structures and thus is the hardest mineral on Earth.

A. Polymorphism
B. Isomorphism

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