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Mineral diversity of the Earth's Crust

Minerals are elements or compounds that occur naturally in the earth's crust . For example , gold and silver found in mineral form . This is called the natural elements . There is also a compound found in the form of minerals , such as carbonate and silicate . This we call the natural compounds .
Mineral properties
1 ) Violence
There are some very hard mineral that can be used as a knife sharpener . And there is also a soft mineral that can be scratched by simply using nails .

2 ) Solubility In Water
There is a mineral that dissolves , and there is no soluble minerals . Examples of such mineral is soluble magnesium oxide and calcium sulphide.
3 ) Heat Effect On Minerals
When heated , the metal oxide does not decompose to form a new material . But metal carbonate will decompose to the metal oxide and carbon dioxide when heated.