cryptocrystalline🔊adjEtymology From crypto- + crystalline.1Geography, Geology, Natural sciences, Petrology Whose crystalline nature only becomes apparent at high levels of magnification.Derived termsmicrocryptocrystalline
cryptocrystalline🔊nounEtymology From crypto- + crystalline.1Geography, Geology, Natural sciences, Petrology A rock of this kind.