A noun for “metal” in The Etymologies of the 1930s derived from the root ᴹ√RAUTĀ of the same meaning (Ety/RAUTĀ). In that document, its Noldorin cognate was the basis for the second element of the names Finrod, Angrod and Damrod. In Tolkien’s later writings the second element of these names were based on S. raud “noble”. For purposes of Neo-Quenya I think it’s better to stick to Q. tinco “metal” from Appendix F of The Lord of the Rings.
Qenya
tinga
noun. *flint
tinga-
verb. to twang, to twang, *to ping
tingahondo
adjective. flint-hearted
tanga-
verb. to twang
rauta
noun. metal
tinko
noun. metal
A verb appearing as tinga- “twang” in The Etymologies of the 1930s glossed derived from the onomatopoeic root ᴹ√TING or ᴹ√TANG (Ety/TING). The Quenya Verbal System (QVS) of 1948 instead had tanga- with past forms tange or tangane “twanged”, derived from ᴹ√TAÑ.
Neo-Quenya: In a 2025-01-30 post to the Vinyë Lambengolmor Discord Server (VLDS), Luinyelle suggested this verb might also mean “✱ping” in the modern internet sense, as in tinganel nin “you pinged me”.