Assertion: white carbon | /r/HasProperty | birefringent
Facets:
Source sentences:
text: While similar to graphite found in a meteor crater in Germany, "white" carbon was birefringent.
text: White carbon is a crystalline soft, transparent and birefringent (having more than one refractive index) allotrope of carbon made first in 1969 from graphite crystals by heating them to a high temperature (4130°F/2277°C) at low pressure.