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Synthetic alexandrite is an artificially grown crystalline variety of chrysoberyl, composed of beryllium aluminum oxide (BeAl 2 O 4). The name is also often used erroneously to describe synthetically-grown corundum that simulates the appearance of alexandrite , but with a different mineral composition.
Hydrothermal lab-grown alexandrite has identical physical and chemical properties to real alexandrite. [ 18 ] Some gemstones falsely described as lab-grown synthetic alexandrite are actually corundum laced with trace elements (e.g., vanadium ) or color-change spinel and are not actually chrysoberyl.
The Alexandrite effect has also been observed in some other minerals, such as fluorite, sapphire, kyanite, monazite, spinel, garnet, tourmaline, and rare-earth oxalates. Not to be confused with the alexandrite effect, some minerals also exhibit pleochroism. The former is a response to different wavelengths of light in general, the latter an ...
An ant inside Baltic amber Unpolished amber stones. Amber is fossilized tree resin.Examples of it have been appreciated for its color and natural beauty since the Neolithic times, [1] and worked as a gemstone since antiquity. [2]
With Meta announcing it is ending its third-party fact-checking program and moving to a community notes model similar to the social platform X, it's more important than ever to follow trusted ...
An amateur fossil hunter has uncovered a piece of animal vomit which dates back 66 million years on a beach in Denmark.