Assertion: alexandrite's color | /r/HasProperty | due
Facets:
value: to impurities
type: CAUSE
value: to the nd3+ ion
type: CAUSE
value: to fe3
type: TEMPORAL
Source sentences:
text: The color in yellow chrysoberyl is due to Fe3+ impurities.
text: The color of neodymium compounds is due to the Nd3+ ion and is often a reddish-purple, but it changes with the type of lighting, because of the interaction of the sharp light absorption bands of neodymium with ambient light enriched with the sharp visible emission bands of mercury, trivalent europium or terbium.
text: These colors are due to the addition of chemical impurities because pure spinel, as with pure sapphire, is colorless.
text: The colors are due to an almost unbelievable complexity of chemical composition, to which John Ruskin‘s quip (1890)
text: The color of amazonite is due to the presence of lead within the stone and color variation may exist within a single stone.