help?!

i want to further my research on the sulfide,tellurite and so on. but i am not familiar with which, and i have to look it in so much referrences, and some difficulty is encounted with me, for example, i can not get the meaning of such symbols P3/mmm(space group symbols), can you tell me some thing about it. thanks in advance!

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What kind of research are you doing. Space groups is a rather advance topic, something I'm not really familiar in anyways.

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