Summer from under the stardust clastic like snowflakes, gently softly falls on Evangeline body, became white crystalclass transparent glaring marriage gauze.
In the study of optical properties of low classcrystal system, the identification of optic sign has important meaning to unknown crystal and mineral determination.
在低级晶族光学特性的研究中,光性符号的确定对未知晶体及矿物的鉴定有着重要的意义。
3
Transition metal nitrides belong to a class of interstitial compounds, have the properties of covalence compound, ion crystal and transitional metals.