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*Archives of Ask A Scientist!*

-About "Ask A Scientist!" -

On September 17th, 1998 the Ithaca Journal ran its first "Ask A Scientist!"
article in which Professor Neil Ashcroft , who was then the director of
CCMR, answered the question "What is Jupiter made of?" Since then, we have
received over 1,000 questions from students and adults from all over the
world. Select questions are answered weekly and published in the Ithaca
Journal and on our web site. "Ask A Scientist!" reaches more than 21,000
Central New York residents through the Ithaca Journal and countless others
around the world throught the "Ask a Scientist!" web site.

Across disciplines and across the state, from Nobel Prize winning scientist
David Lee to notable science education advocate Bill Nye, researchers and
scientists have been called on to respond to these questions. For more than
seven years, kids - and a few adults - have been submitting their queries
to find out the answer to life's everyday questions.

Previous Week's Question Published: 19 May, 2005 Next Week's Question

Atoms combine to form unit cells, which create crystals
How are crystals formed?
Ask your own question!

Crystals can form in a few minutes or take thousands of years to grow. But
all crystals that you can see with your eyes are made of many trillions of
extremely small building blocks called atoms. A grain of salt is a simple
crystal which is made of two types of atoms: sodium and chlorine. If you
look at a salt crystal carefully (or under a microscope)


how are crystals formed

Crystal - Wikipedia, the free encyclopedia


** Crystal **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about crystalline solids. For the type of glass, see Lead
glass. For other uses, see Crystal (disambiguation).
"Crystals" and "Xtal" redirect here. For other uses, see Crystals
(disambiguation) and Xtal (disambiguation).

This article *needs additional citations for verification*. Please help
improve this article by adding citations to reliable sources. Unsourced
material may be challenged and removed. /(January 2012)/

A crystal of amethyst quartz.
Microscopically, a single crystal has atoms in a near-perfect periodic
arrangement; a polycrystal is composed of many microscopic crystals (called
"crystallites" or "grains"); and an amorphous solid (such as glass) has no
periodic arrangement even microscopically.

A *crystal* or *crystalline solid* is a solid material whose constituent
atoms, molecules, or ions are arranged in an ordered pattern extending in
all three spatial dimensions. In addition to their microscopic structure,
large crystals are usually identifiable by their macroscopic geometrical
shape, consisting of flat faces with specific, characteristic
orientations.^[/citation needed/]

The scientific study of crystals and crystal formation is known as
crystallography. The process of crystal formation via mechanisms of crystal
growth is called crystallization or solidification. The word /crystal/ is
derived from the Ancient Greek word
κρύσταλλος (/krustallos/), meaning both
“ice” and “rock crystal”,^[1] from κρύος
(/kruos/), "icy cold, frost".^[2]^[3]

Common crystals include snowflakes, diamonds, and table salt; however, most
common inorganic solids are polycrystals. Crystals are often symmetrically
intergrown to form crystal twins.


· 1 Crystal structure (microscopic)
· 2 Crystal faces and shapes
· 3 Occurrence in nature

· 3.1 Rocks
· 3.2 Ice
· 3.3 Organigenic crystals

· 4 Polymorphism and allotropy
· 5 Crystallization
· 6 Defects, impurities, and twinning
· 7 Chemical bonds



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