Assertion: opal's appearance | /r/HasProperty | cloudy
Facets:
Source sentences:
text: Fire opal typically exhibits a hazy or cloudy appearance, which is a result of slight opalescence (adularescence).
text: Water penetration can eventually cause the glue to deteriorate and the layers to separate, causing the opal to take on a foggy, grey, or cloudy appearance.
text: However, doublet and triplet opals can be damaged by prolonged exposure to water (or any liquid) as the water penetration can cause the glue to deteriorate and eventually separate the layers, causing the opal to take on a foggy or cloudy appearance.