Ad
related to: mexican gem that changes color from green to purple and turns blue to red
Search results
Results From The WOW.Com Content Network
Bauhin observed that when water was poured into the cup with the wood shavings, the water shortly turned into "a wonderful blue and yellow color, and when held up against the light beautifully resembled the varying color of the opal, giving forth reflections, as in that gem, of fiery yellow, bright red, glowing purple, and sea green most ...
The intense blue color is due to the presence of the trisulfur radical anion (S •− 3) in the crystal. [16] The presence of disulfur (S •− 2) and tetrasulfur (S •− 4) radicals can shift the color towards yellow or red, respectively. [17] These radical anions substitute for the chloride anions within the sodalite structure. [18] The S ...
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]
Those colored by the V chromophore can show a more pronounced change, moving from blue-green to purple. Certain synthetic color-change sapphires have a similar color change to the natural gemstone alexandrite and they are sometimes marketed as "alexandrium" or "synthetic alexandrite". However, the latter term is a misnomer: synthetic color ...
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7] Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or purple. [8] Topaz is a nesosilicate mineral, and more specifically, an aluminosilicate mineral. [9]
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
A modern parallel to ancient miners seeking luminous gems at nighttime is mineworkers using portable shortwave ultraviolet lamps to locate ores that respond with color-specific fluorescence. For instance, under short-wave UV light, scheelite , a tungsten ore, fluoresces a bright sky-blue, and willemite , a minor ore of zinc , fluoresces green ...