Tourmaline yog lub npe dav dav ntawm tourmaline pawg minerals.Nws cov tshuaj muaj pes tsawg leeg yog qhov nyuaj.Nws yog ib lub nplhaib qauv silicate ntxhia cim los ntawm boron uas muaj txhuas, sodium, hlau, magnesium thiab lithium.[1] Lub hardness ntawm tourmaline feem ntau yog ...
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