Assertion: chalcedony's color | /r/HasProperty | due
Facets:
value: to fibrous inclusions of a mineral
type: CAUSE
value: to iron oxide
type: CAUSE
value: to ferric iron
type: CAUSE
value: to traces of copper
type: CAUSE
value: to iron(iii) inclusions
type: CAUSE
value: to iron impurities
type: CAUSE
Source sentences:
text: Psilomelane chalcedony - chalcedony with black bands, the color of which are due to the presence of psilomelane, from Mexico.
text: Its color, like that of jasper, is due to iron impurities.
text: The common red color is due to iron(III) inclusions.
text: Recent X-ray diffraction studies suggest that the color is due to thin microscopic fibers of possibly dumortierite within the quartz.
text: The name is from the old French citrin meaning yellow , and the color is due to ferric iron.
text: The name is from the old French meaning , and the color is due to ferric iron.
text: The color of rose quartz is due to fibrous inclusions of a mineral similar to dumortierite.
text: The color of rose quartz is due to fibrous inclusions of a mineral similar to dumortierite.
text: The color is due to iron oxide.
text: The color is due to iron oxide.
text: Many people assumed the color was due to traces of copper because copper compounds often have blue and green colors.