Oct. birthstone (4 letters)

{ Answer }

OPAL

{ Related Clues }

Gem
Gemstone
Australian gem
Fall birthstone
Form of silica
Iridescent gem
Jewel of a girl
Milky gem
October birthstone
October stone
Oct.'s stone
Silica gem
Solitaire item
Type of glass
Libran's stone, maybe
Milky white gem
Milky-white gem
Relative of a cat's-eye
Stone for a Libra, traditionally
Stone of many Libras
Word with black or fire
Birthstone of someone born on Halloween
It's mined in South Australia
It's worn by many Libras

{ Tags }

birthstone, cacholong, fire, gem, gemstone, geyserite, girasol, hyalite, iridescent, its, libras, many, milky, mundi, october, oculus, opal, shade, silica, stone, white

{ Notes }

The answer OPAL is very common and appears about once every 41.0 puzzles.

{ Definition }

OPAL as a noun:

1. a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones