岩石中矿物晶粒极为细小，肉眼无法分辨出矿物颗粒，甚至在偏光显微镜下也不能分辨，但有光性反应，据此可与玻璃质相区别。一般火山岩常具有隐晶质。
adj. cryptocrystalline
misc. aphanocrystalline
研究了隐晶质石墨的提纯工艺中焙烧动力学方程。
Kinetic equation in the baking process of purifying aphanitic graphite were researched.
结果表明，四川软玉猫眼主要由微晶隐晶质透闪石矿物集合体组成；
The results indicate that the nephrite cat's eye mainly consists of aggregates of microcrystalline-cryptocrystalline tremolites.
矿石的主要结构是隐晶质结构、胶状结构、显微鳞片结构及砂质结构。
The textures of the manganese-silver ore include aphanitic, colloform, micro-squama and arenaceous textures, and its structures are mainly the vein, colloform and disserminated structures.
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