We don't have synonyms for laumonite yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ammonite, laumontite and lomonite.
(n) :
Alternative spelling of laumontite. [(mineralogy) A mineral, of a white color and vitreous luster, with the chemical formula CaAl₂Si₄O₁₂·4H₂O. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles.]
(n) :
Alternative spelling of laumontite. [(mineralogy) A mineral, of a white color and vitreous luster, with the chemical formula CaAl₂Si₄O₁₂·4H₂O. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles.]