opal-like

World English Dictionary
opal (ˈəʊpəl)
 
n
an amorphous, usually iridescent, mineral that can be of almost any colour, found in igneous rocks and around hot springs. It is used as a gemstone. Composition: hydrated silica. Formula: SiO2.nH2O
 
[C16: from Latin opalus, from Greek opallios, from Sanskrit upala precious stone]
 
'opal-like
 
adj

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