As magma cools, its _____ combine into compounds that form a crystal structure, and becomes a mineral

The hardest mineral on Earth is?

Minerals are comprised of one or more _______

A collector of minerals would want a sample of _________.

Calcite will scratch gypsum. This is an example of the physical characteristics called?

Muscovite mica will peel off in flat sheets. This is an example of the physical characteristics called?

All minerals share the following characteristics EXCEPT that of ____

One of the softest minerals is

A mineral is an inorganic ______ with a unique crystal structure.

Qualities of a stone that make it a gemstone are _______

Some minerals are formed when ______ cools

Two minerals that are ores of titanium are

The term "crystal system" refers to th patterns that _____ form in a crystal

Titanium is useful because it is

When liquid evaporates, atoms of any dissolved minerals stay behind and form _________

Two types of ________ are metallic and nonmetallic

Tests for hardness and streak help _______ minerals

__________ alone usually is not enough to identify a mineral

_______ is the color of a powdered mineral

____ is the tendency of minerals to break with rough or jagged surfaces.

A measure of how easily a mineral can be scratched is

_____ is how light is reflected from a mineral

_____ is the distinctive yellow of sulfur

_____ is the tendency of a mineral to break along a smooth, flat surface.

______ are minerals that are mined because they contain useful substances

What is the most common element in Earth's crust?

98% of the Earths crust is made up of only _____ elements

______ percent of th eEarth's crust is made up of calcium.

One of the most common rock-forming minerals on are Earth is

Approximately what percent of Earth's crust is made up of oxygen and silicon?

A mineral is no longer classified as an ore once it is no longer ____________.