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.
alasta
adjective. of marble, marble
alas
noun. marble
A noun appearing as ᴱQ. alas (alast-) “marble” in the Qenya Lexicon of the 1910s derived from primitive ᴱ✶ʒalast- (QL/30).
Neo-Quenya: I think this word may be salvageable in Neo-Quenya as ᴺQ. alas, reconceived as a derivative of ᴹ√GALAS “joy, be glad”, perhaps from ᴺ✶galast- originally with the sense “thing pleasant to touch”.
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 word in the Qenya Lexicon of the 1910s given as ᴱQ. alasta “of marble, marble”, an adjectival form of ᴱQ. alas (alast-) “marble” (QL/30).
Neo-Quenya: I think it might likewise be used in Neo-Quenya as ᴺQ. alasta, an adjectival form of ᴺQ. alas “marble”.