Assertion: citrine's color | /r/CapableOf | become yellow
Facets:
value: to colorless
type: OTHER
value: to green
type: OTHER
Source sentences:
text: Subjecting amethyst to heat will reduce the oxidation state of the iron impurities in the quartz structure thereby causing amethyst's purple color to fade and become yellow to reddish-orange (citrine), green, or colorless depending on the site and original oxidation state of the iron impurities present and depending on the amount and duration of the heat applied.