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Tourmaline lulú
Tourmaline lulú jẹ lulú ti a gba nipasẹ ẹrọ ti npa irin irin-ajo tourmaline atilẹba lẹhin yiyọ awọn aimọ.Tourmaline lulú ti a ti ni ilọsiwaju ati mimọ ni iran anion ti o ga julọ ati imukuro infurarẹẹdi ti o jinna.Tourmaline tun ni a npe ni Tourmaline.Agbekalẹ kemikali gbogbogbo Tourmaline jẹ NaR3Al6Si6O18BO33 (OH, F.).4, kirisita naa jẹ ti eto eto trigonal ti awọn ohun alumọni silicate be cyclic ni gbogbogbo.Ninu agbekalẹ, R ṣe aṣoju cation irin kan.Nigbati R jẹ Fe2 +, o jẹ tourmaline kirisita dudu kan.Awọn kirisita Tourmaline wa ni apẹrẹ ti awọn ọwọn onigun mẹta ti o fẹrẹẹ, pẹlu oriṣiriṣi awọn apẹrẹ gara ni awọn opin mejeeji.Awọn ọwọn naa ni awọn ila gigun, nigbagbogbo ni irisi awọn ọwọn, awọn abere, awọn radials, ati awọn akojọpọ nla.Gilasi didan, didan resini fifọ, translucent si sihin.Ko si cleavage.Mohs líle 7-7.5, kan pato walẹ 2.98-3.20.Piezoelectricity ati pyroelectricity wa.
