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Name: Chris
Status: student
Grade: 9-12
Location: VA
Country: USA
Question:
How many types of crystals are there?

Replies:
Chris-

These are the basic crystal systems:
cubic
tetragonal
orthorhombic
hexagonal
rhombohedral
monoclinic
triclinic

There are subgroups of each of these. A wider discussion can be found at:

http://en.wikipedia.org/wiki/Crystal_system

They are very important in chemistry and materials science.

---Nathan A. Unterman


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