Mid 19th century; earliest use found in Henry Thomas De la Beche (1796–1855), geologist. Probably either from porcelain + -ic, or alteration of porcellanicafter porcelain.
Definition of porcelainic in US English:
porcelainic
adjectiveˌpɔːsɪˈleɪnɪk
Porcellaneous.
Origin
Mid 19th century; earliest use found in Henry Thomas De la Beche (1796–1855), geologist. Probably either from porcelain + -ic, or alteration of porcellanic after porcelain.