Assertion: quartz | /r/HasProperty | birefringent
Facets:
value: slightly
type: DEGREE
value: along the c-axis
type: LOCATION
Source sentences:
text: Interestingly, Frondel (1962) reports that Fresnel (1831) found quartz to be slightly birefringent along the c-axis, the value given is 0.000071.
text: and the extraordinary ray n e (quartz is birefringent) lists values given by ->Bauer, with colors given instead of wavelengths.