geophone
geophone is an idiophone or Membranophone.
Overview
Musical instrument.
In detail
geophone is an idiophone or Membranophone.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Geophone (musical instrument)”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q5535564: geophone
Consult the source