Referring to a type of igneous rock that has crystals so small that they are not visible to the naked eye.

अदृश्य क्रिस्टल वाले आग्नेय रॉक

English Usage: The geologist described the mineral composition of the aphanitic rock sample he collected.

Hindi Usage: भूविज्ञानी ने उस अज्ञात क्रिस्टल वाले आग्नेय रॉक के नमूने की खनिज संरचना का वर्णन किया।