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Sib tsoo iav hlaws
Hauv av iav hlaws, zoo li: tsis muaj xim pob tshab kheej kheej, du thiab puag ncig, tsis pom tseeb npuas lossis impurities.
Rounding tus nqi: rounding tus nqi ≥80%;
Qhov ceev: 2.4-2.6g / cm3;
Refractive Performance index: Nd ≥ 1.50;
Cov khoom xyaw: sodium calcium iav, SiO2 cov ntsiab lus ＞ 68%;
Compressive zog:> 1200n;
Mohs hardness: 6-7.
