Assertion: chalcedony's amount | /r/HasProperty | added
Facets:
Source sentences:
text: When a small amount of impurities or foreign materials are added, the color of the microcrystalline quartz changes and its ability to transmit light decreases.
text: When a small amount of impurities or foreign materials are added, the color of the microcrystalline quartz changes and its ability to transmit light decreases.