Opal Visible Spectra (400 - 1000 nm)
Images of opal absorption spectra
-
GRR
1824 spectrum; Cherry opal (red variety)
from Opal Mountain, San Bernardino County,
California. Plotted as 1.282 mm thick. The
orangish-red color of this material
comes from Fe3+. The absorption bands
are similar in position to those
of hematite suggesting that sub-microscopic domains of hematite are the
cause of the color. Data Files: 1.282 mm thick;
0.537 mm thick
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