Assertion: sun's effect | /r/HasProperty | due
Facets:
value: to copper
type: CAUSE
value: in the form of minute scales
type: OTHER
Source sentences:
text: The optical effect appears to be due to reflections from inclusions of red copper, in the form of minute scales, which are hexagonal, rhombic, or irregular in shape, and are disposed parallel to the principal cleavage-plane.
text: The optical effect called schiller and the color in Oregon Sunstone is due to copper.