Category:Cryptocrystalline

Cryp`to*crys"tal*line (-krs"tal-ln), a. Etym: [Gr. krypto`s hidden + E. crystalline.] (Geol.)

Defn: Indistinctly crystalline; -- applied to rocks and minerals, whose state of aggregation is so fine that no distinct particles are visible, even under the microscope.