Ad
related to: mexican gem that changes color in light red and yellow to orange
Search results
Results From The WOW.Com Content Network
Stones that show a dramatic color change and strong colors (e.g., red-to-green) are rare and sought-after, [8] but stones that show less distinct colors (e.g. yellowish green changing to brownish yellow) may also be considered "alexandrite" by gem labs such as the Gemological Institute of America. [13] [14]
Chiapan amber has a number of unique qualities, including much that is clear all the way through and some with fossilized insects and plants. Most Chiapan amber is worked into jewelry including pendants, rings and necklaces. Colors vary from white to yellow/orange to a deep red, but there are also green and pink tones as well.
The gem quality material was first discovered in the early 1980s. [4] Zultanite has a hardness of 6.5 to 7. [5] Depending on its light source, zultanite's color varies between a yellowish green, light gold, and purplish pink. [1] Its color can be pastel green in outdoor light and beige pink in incandescent light. [6]: 105
near colorless to light green – inert to weak orange in longwave and weak yellow-orange in shortwave; yellow – inert to weak orange in longwave and shortwave [2] Absorption spectra: Hessonite sometimes shows bands at 407 and 430 nm: Major varieties; Hessonite: yellow-red to reddish-orange: Tsavorite: intense green to yellowish green: Leuco ...
They found that as little as 0.002 atoms per formula unit (apfu) of Cr 6+ substituting for Mo 6+ is adequate to result in an orange-hued specimen. Cr 6+ apfu values of 0.01 were able to result in a red color. Talla et al. went on to emphasize that the colors result from a change of absorption intensity rather than a change of spectral position ...
Despite their findings, the presence of these aromatic hydrocarbons has not been confirmed in samples of blue amber. While all types of amber tested displayed a fluorescence, blue amber fluoresced with a greater intensity, even though the absorption extinction coefficient was larger for red and yellow amber. Polished blue amber under direct ...
Like the purple color of amethyst, the yellow color in ametrine originates from trace amounts of iron in the crystal structure. The difference in coloration is due to the iron existing in different oxidation states. The yellow segments have been oxidized by heat, while the amethyst segments remain unoxidized.
Spessartine of an orange-yellow has been called Mandarin garnet and is found in Madagascar. Violet-red spessartines are found in rhyolites in Colorado and Maine. In Madagascar, spessartines are exploited either in their bedrock or in alluvium. The orange garnets result from sodium-rich pegmatites.