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Violaxanthin is a xanthophyll pigment with an orange color found in a variety of plants. Violaxanthin is the product of the epoxidation of zeaxanthin where the oxygen atoms are from reactive oxygen species (ROS). Such ROS's arise when a plant is subject to solar radiation so intense that the light cannot all be absorbed by the chlorophyll.
Xanthoria parietina produces an orange colored anthraquinone pigment, parietin, that is deposited as tiny crystals in the top layer of the upper cortex. Parietin synthesis is enhanced by UV-B , [ 24 ] and stimulated by photosynthates, such as those provided by the green algal Trebouxia symbiont. [ 25 ]
It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, often in association with the related mineral, orpiment (As 2 S 3). It is orange-red in color, melts at 320 °C, and burns with a bluish flame releasing fumes of arsenic and sulfur.
The high water content of the magma made it possible for the crystals to grow quickly, so pegmatite crystals are often quite large, which increases the likelihood of gem specimens forming. Chrysoberyl can also grow in the country rocks near to pegmatites, when Be- and Al-rich fluids from the pegmatite react with surrounding minerals.
Orpiment, also known as ″yellow arsenic blende″ is a deep-colored, orange-yellow arsenic sulfide mineral with formula As 2 S 3.It is found in volcanic fumaroles, low-temperature hydrothermal veins, and hot springs and may be formed through sublimation.
Crystals are deep red in color and usually very well-formed. Wulfenite was approved as the official state mineral of Arizona in 2017. [5] The Los Lamentos locality in Mexico produced very thick tabular orange crystals. Another locality is Mount Peca in Slovenia. The crystals are yellow, often with well-developed pyramids and bipyramids.
According to BBC reporter Matt Stirn, yaupon tea brews as "a yellow to dark-orange elixir with a fruity and earthy aroma and a smooth flavour with malty tones" and its "ratio of stimulating xanthines such as caffeine, theobromine and theophylline release slowly into the body, providing a jitter-free mental clarity and an ease to the stomach." [3]
Rubixanthin, or natural yellow 27, is a natural xanthophyll pigment with a red-orange color found in rose hips.As a food additive it used under the E number E161d as a food coloring; it is not approved for use in the USA [citation needed] or EU [2] but is approved in Australia and New Zealand [3] where it is listed as 161d.