Assertion: zircon's index | /r/CapableOf | range for high 1.97
Facets:
value: from 1.92
type: OTHER
Source sentences:
text: High zircon refractive indices range from 1.92 - 1.94 (often 1.925) for the ordinary ray and an especially high 1.97 - 2.01 for the extraordinary ray.