Proto-IE: *mel-
Meaning: sand, clay
Old Indian: maṇḍa- m., n. `scum of boiled rice (or any grain); thick part of milk, cream'; mŕ̥d- f. `earth, soil, clay, loam', mr̥tsna- m., n. `dust, powder', mr̥tsnā f. `clay, loam'
Old Greek: blén(n)a f., blénno-s m. `Schleim, Rotz', blénno- `rotzig, schleimig; dumm'
Russ. meaning: песок, глина etc.
References: WP II 284 f