TOPAZ

TOPAZ, mineralest az guruhi silikatho, Al2(Sio4) (G, ON)2. Kris- tallhoi prizmashakl (vaanashon to 60—80 kg) hosil mekunad. Rangi Topaz zard, sabz, kabud va gulobist; Topazi berang niz hast. Sakhtiash 8; zichiash 3400—3640 kg/m3. Kristallhoi shaffofi berang va khushrangi Topaz sangi qimatbahoyand. Jinshoi Topazdor (greyzenho)-ro chun masolehi otashtobovar istifoda mebarand. Dar Tojikiston (dar kuhhoi Pomiri Sharqi) koni Topaz mavjud ast.