Fact About Crystals (Minerals)

Minerals only rarely form in large, distinct crystals like these. Most of the time they form much smaller grains, and are mixed in wich others minerals in rocks Granite, for instance, is made of the minerals feldspar, quartz and mica, along with small amounts of others minerals. Quartzcis a silicate mineral - the most common silicate mineral of all - but over 99 percent of it is actually mixed in with other minrrals in granite and other rocks, such as sandstone.

FACTS: About crystals

• What are crystals
  Crystals are glassy-looking, brittle solids that form in regular shapes with sharp corners and flat sides.

• Crystals Shapes
  Crystals are regular and there are only a certain number of possible basic regular shapes called systems cubic pyramaid and so on. The crystals of each mineral fit into one of these systems.

Minerals Are The natural chemicals from which the Earth's crust is made. A few are powdery or resinous, but most are crystals. Usually, minerals occur asal a mass of tiny crystals or grain, Occasionally, though, crystals grow as big as flagpoles, Geologistscidentify minerals by various factors including the colour and shafe of the crystal. There are 2,000 or so different minerals, but under a hundred are common. A handful of minerals are pure chemical element that occur naturally , sacb as gold or silver. Most are compounds, of which by far the most common are silicaters.

img source: http://www.dreams.metroeve.com/minerals/

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