Gilashin gilashin ƙasa, bayyanar: fili mara launi, santsi da zagaye, ba tare da bayyananniyar kumfa ko ƙazanta ba.
Ƙididdigar zagaye: ƙimar zagaye ≥ 80%;
Girma: 2.4-2.6g/cm3;
Ƙwararren Ƙwararru: Nd ≥ 1.50;
Abun da ke ciki: gilashin calcium calcium, SiO2 abun ciki : 68%;
Ƙarfin matsi: > 1200n;
Taurin Mohs: 6-7.