Assertion: opal's variety | /r/HasProperty | precious opal
Facets:
Source sentences:
text: The principal varieties of opal are: Precious opal , a transparent variety exhibiting a delicate play of colors, Fire opal , a precious opal in which the background colors are quite brilliant shades of red and yellow, Common opal , a translucent variety without any distinct play of colors, Hyalite , a transparent, colorless variety, usually in globular or botryoidal masses,
text: The other variety, gem-quality opal, is called precious opal.