What Are Crystals?
A crystal is a hard, solid substance
made of molecules that bond together in specific patterns to form an
interesting shape that has straight edges and flat surfaces. Not all crystals
have the same shape, there are actually lots of different kinds of crystals,
and each kind has its own special shape. Beautiful crystals are used for
jewelry, like diamonds or emeralds. Crystals are often transparent, which means
that you can see through them sort of like you can see through glass. Other
kinds have beautiful colors.
What a crystal is made of actually
depends on what kind of crystal it is - for example, salt and snowflakes are
actually formed out of different kinds of crystals. Snowflakes are made from
crystals formed by frozen water. Salt crystals are formed by some chemical
elements which join together in a crystal shape. Crystals can be formed in
several different ways. Most crystals are formed through evaporation. Some
types of crystals are formed from melted rock in the earth: When the hot rock
cools gradually, it will sometimes form crystals. Geodes are round
rocks that are formed when bubbles are trapped in the melted rock. As the
bubbles cool down, crystals grow inside of the bubble of rock.
As a crystal grows, the pattern that makes it a certain
shape will be repeated over and over, so the crystal will always keep the same
shape as it gets bigger. The chemical elements that a crystal is made of are
what tell the crystal what shape it will be. A lot of crystals might seem to
look alike, but what elements the crystal is made out of will make it a unique
shape and color. Even the same element can make different crystals, based on
conditions such as temperature and light and what other elements are around.
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