Opal

Definition:

• (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.

Compare opal with other words:

opah vs. opal

opal vs. oval

copal vs. opal

opal vs. pal

nopal vs. opal

opal vs. oral

moonstone vs. opal

hyalite vs. opal

opal vs. opalized

opal vs. opalize

geyserite vs. opal

chalcedony vs. opal

nacre vs. opal

opal vs. pearl

opal vs. sandstone

opal vs. potch

mullock vs. opal

fiorite vs. opal

jasper vs. opal

opal vs. opalescent

opal vs. petrol

opal vs. opalesce

opal vs. silica

opal vs. opaline

opal vs. quartz

noodle vs. opal

opal vs. silicon