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A visible light photon knocks a proton out of a water molecule, leaving a hydroxide ion (OH −). In turn, a divalent iron Fe 2+ loses an electron to become Fe 3+, i.e., it is oxidized and balances the charge. This process starts when visible light falls on the vivianite, and it can occur within a few minutes, drastically changing the color of ...
Mexican amber is mainly recovered from fossil bearing rocks in the Simojovel region of Chiapas, Mexico. It is one of the main minerals recovered in the state of Chiapas, much of which is from 15 to 23 million years old, with quality comparable to that found in the Dominican Republic. Chiapan amber has a number of unique qualities, including ...
Bahia Emerald [2]; Carolina Emperor, [3] [4] 310 carats uncut, 64.8 carats cut; discovered in the United States in 2009, resides in the North Carolina Museum of Natural Sciences, Raleigh, NC, US
The gemstone is mined across the globe in Namibia, Tanzania, Myanmar, Brazil, Iran, Afghanistan, Pakistan, India and Sri Lanka, according to Geological Institute of America. Garnet meaning
Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca 3 Fe 2 (SiO 4) 3 with chromium substitution as the cause of the demantoid green color. Ferric iron is the cause of the yellow in the stone.
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
Variscite has been used in Europe to make personal ornaments, especially beads, since Neolithic times. Its use continued during the Bronze Age and in Roman times although it was not until the 19th century that it was determined that all variscite used in Europe came from three sites in Spain, Gavá (Barcelona), Palazuelo de las Cuevas (Zamora), and Encinasola (Huelva).
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