Презентация на тему Minerals

are crystalline and abiogenic in origin. A mineral is different from

a rock, which can be an aggregate of minerals or non-minerals and does not have one specific chemical composition, as a mineral does.

5,300 known mineral species. The silicate minerals compose over 90% of the Earth's

crust.

two dominant systems are the Dana classification and the

Strunz classification.
 
 
The general definition of a mineral encompasses the following criteria:
Naturally occurring
Stable at room temperature
Represented by a chemical formula
Usually abiogenic (not resulting from the activity of living organisms)
Ordered atomic arrangement

is dominated by silicon and oxygen, silicate elements are

by far the most important class of minerals in terms of rock formation and diversity. However, non-silicate minerals are of great economic importance, especially as ores.

one or more minerals, or not composed of minerals

at all. 

much more abundant than others; these are termed the

rock-forming minerals.

as gem minerals, which constitute about 35 of the

most common gemstones.