Exam 2: Minerals

A positively charged ion is a __________.

A/an __________ __________ is a planar surface that develops if a crystal grows freely without obstructions.

Copper, lead, and zinc commonly form:

The basic unit of all silicates is the __________.

Cleavage is the tendency of some minerals to break along flat surfaces.

__________ __________ is the weight of a substance relative to that of an equal volume of water.

It is not necessary for a substance to be a solid to be a mineral.

Which of the following describes a crystal?

Only eight elements-oxygen, silicon, aluminum, iron, calcium, magnesium, potassium, and sodium-make up more than 98 percent of the Earth's crust.

An element cannot be broken into smaller substances by ordinary chemical processes.

Minerals are classified according to their:

A substance in which atoms are arranged without a regular, orderly, periodically repeated pattern is called a crystal.

A mineral that is valued for its beauty rather than for industrial use is a/an __________.

Which of the following best describes an element?

Minerals whose chemical elements include carbon and oxygen as a major part of their chemical composition are called __________.

Halite (table salt) is composed of __________.

Ninety-two percent of the Earth's crust is composed of __________ minerals.

Radon forms by the radioactive decay of __________.

Which one of the following is not a mineral?

Feldspar is a __________ mineral.