晶体的特征 (1)具有规则的几何外形,而非晶体没有一定的外形(俗称无定形体)。 (2)具有固定的熔点,而非晶体则无固定熔点。 3)各向异性( anisotropy),而非晶体显各向同性 (isotropy) () Quartz is a crystalline form of silica. sio, with the atoms in an orderly network, represented here in two dimensions (Right) When molten silica solidifies, it becomes glass. Now the atoms form a disorderly network(1) 具有规则的几何外形，而非晶体没有一定的外形 具有规则的几何外形，而非晶体没有一定的外形(俗称无定形体)。 (2) 具有固定的熔点，而非晶体则无固定熔点。 具有固定的熔点，而非晶体则无固定熔点。 (3) 各向异性(anisotropy) anisotropy)，而非晶体显各向同性 而非晶体显各向同性(isotropy) isotropy)。 ¾ 晶体的特征 (Left) Quartz is a crystalline form Quartz is a crystalline form of silica, SiO of silica, SiO2, with the atoms in , with the atoms in an orderly network, represented an orderly network, represented here in two dimensions. here in two dimensions. (Right) (Right) When molten silica When molten silica solidifies, it becomes glass. Now solidifies, it becomes glass. Now the atoms form a disorderly the atoms form a disorderly network. network