Assertion: topaz's crystal | /r/CapableOf | turn into limonite
Facets:
value: mostly
type: DEGREE
Source sentences:
text: As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.