A word for “sand” from Early Qenya Word-lists of the 1920s (PE16/139). Its etymology is unclear, and none of the words from this period with similar forms seem to be related.
Early Quenya
marma
noun. sand
tyusse
noun. sand
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A noun in the Qenya Lexicon of the 1910s glossed “sand”, a derivative of the root ᴱ√MṚŘṚ [MṚÐṚ] (QL/63). The word was also mentioned in the Poetic and Mythological Words of Eldarissa (PME/63). In later writings, ᴹQ. litse was used for “sand” (Ety/LIT).