looking for rock crystal classifications and pictures?
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visit  http://webmineral.com/ you can learn what you want with details from there, I sometimes use this site
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here are some useful sites visit them-\n\nhttp://www.stolaf.edu/people/hansonr/mo/x-ray.html\n\nhttp://news.uns.purdue.edu/html4ever/9804.Crystallography.html
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http://www.msnucleus.org/membership/html/jh/earth/metamorphic/lesson1/metamorphic1b.html\n\nThis site has the best diagram I found.  Slate is the first stage of metamophism of pelitic rocks (mainly mudstones).
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The crystal structure. All minerals can be classified within 14 basic crystal lattice arrangements of the atoms in three dimensions. These 14 lattice arrangements fit within 7 larger crystal systems, allowing the classification of atomic structure of all known minerals.  To see diagrams of these go here:\nhttp://en.wikipedia.org/wiki/Crystal_structure
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The question is not clear.  Are you asking what a crystal is?  Are you asking what the different crystal structures are?  Are you asking for the characteristics of crystals in general?
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http://www.galleries.com/minerals/elements/silicon/silicon.jpg\n\nits grey and shiny...not too exciting.
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3 main types: igneous, sedimentary, and metamorphic
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try this page ;-)\nhttp://www.gemstone.org/gem-by-gem/english/ruby.html
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crystals@whidbey.com \n\nthere you go :)
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well, do you have access to a stone saw?  Look for crystalline structure inside of the object.  Also determine it's specific gravity, and you can look it up on the jpl web site.  First though is it metal, magnetic? Or a rock.
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http://www.ddoty.com/patterns.html\n\nYou have to look through them, but if you see a particular flower or animal on the glass that you want to identify, that might help you narrow down the style you are looking for.\n\nIf you google sites, type in "carnival glass patterns" or "crystal patterns".  That might bring up some other websites with more information.  I don't have too much information about crystal.\n\nMaybe try this:\n\nhttp://www.villagekitchen.com/mfg/arc/arques/arques_crystal_index.html
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go to www.google.com them write periodic table and than go to images and you'll see
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phyllite, basalt, slate, shale. There are many types of schist. It is defined mainly as being a plated metamorphic rock in which the mineral crystals can bee seen with the naked eye.
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Also check out the " Four Peaks Amethyst Mine", its in Arizona. It will give you additional information which you are seeking.
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Here are some potential sources:\n\nhttp://www.bestcrystals.com/ulexite.htm\n\nhttp://www.northwestnatureshop.com/department/Rocks_and_Minerals/Rock_and_Mineral_Specimens/592.html\n\nI'm sure you could find more if you googled it like I did.
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there are a few diff. types of crystals....there's hard rock candy crystals, crystal ball, crystal chandelier...crystal meth...they pretty much speak for themselves.
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http://en.wikipedia.org/wiki/Image:Diamond_unit_cell.PNG\n\nhttp://en.wikipedia.org/wiki/Diamond#Crystal_structure