More detailed information about the gemstone Chrysoberyl (cat's eye and alexandrite): information & pictures. In general, chrysoberyl is a green to yellow gemstone with some rare varieties bearing special names. All you ever wanted to know about Chrysoberyl. A beryllium alumina mineral belonging to the class of oxide and hydroxide minerals, Chrysoberyl appears as trilling or twin hexagonal crystals.

One could call Chrysoberyl an extreme gemstone.

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Common Chrysoberyl is yellowish-green and opaque to sheer. If it is light emerald in colour and clear, it is used as a gem. Chrysoberyl's three major strains are: common chrysoberyl in colour from usual orange to blue, cat's eyes or cymophan and Alexandre. Chrysoberyl yellow-green was called "Chrysolith" in the Victorian epoch and the Edvardian epoch, which led to disorientation, since this name was also used for the rock olive ("peridot" as gemstone); this name is no longer used in the geological census.

In the vernacularly known as " cat's eyes " remains of many people. Cutting into a combochon, the rock becomes a pale blue with a silken strip of silk over the rock face. The chrysoberyl is produced by pegmatic pathways. The chrysoberyl can also be found in land rock near the presence of peegmatites when Al and Al enriched liquids from the peegmatite interact with the ambient crystals.

As it is a high-density, harder rock-lime rock material, it can be decomposed from rock and stored in sediments of sand and gravel in floodplains with other precious stone materials such as diamonds, alumina, topaz, spinels, garnets and tourmalines. A large part of the chrysoberyl mines quarried in Brazil and Sri Lanka is extracted from posters, as the hosting rock is heavily degraded and washed out.

When the liquid is high in pegmatites, either chrysoberyl or Beryllium crystal may be formed. The proportion of the beryllium to the aluminum is high, whereas the opposite is the case for chrysoberyl. They are both sturdy with the usual crystal glass. In order for it to develop, some chrome should also be present.

Therefore, an Alexandriite can only be grown if high-yielding pegmatite liquids interact with Cr-rich land rocks. The uncommon demand of this type of chrysoberyl is explained by its rareness. Aleksandrite from the Urals in Russia can be either colored blue in the daytime or reddish in the glow. Others of Alexandriite can be yellow or rose in the daytime and akelei or rasberry when lit by day.

Alexandriite stair pillow, 26. Nils Gustaf Nordenskiöld (1792-1866), a Finish minerals expert, found Alexandriite in honour of the later Tsar Alexander II of Russia. Nordenskiöld's first detection was the outcome of an investigation of a recently found rock specimen he had obtained from Perovskii, which he initially described as emerging.

Alexandrites 5 carat (1,000 mg) and bigger were found in the Urals, but have since been found in bigger size in Brazil. Alexandrites in three carat and more are very seldom. Yellow chrysoberyl is referred to as cyclophane or cat's loa. It is also derived from the Hellenic words "wave" and "appearance", in relation to the blur which distort what is normally considered a well-defined area of a cabin.

The best examples of this effect are gems that are ground in cabochons at right angles to the carbon centre. Chrysoberyl colour is due to Fe3+ contamination. Even though other mineral such as turmaline, skapolite, corundum, spinel or silica can produce similar rocks like cymophan, the jewellery world calls these rocks "quartz cat's eyes" or "ruby cat's eyes" and only chrysoberyl can be called "cat's eye" without any other name.

Gemstones without the silken entrapments needed for the cat's gaze effect are usually beveled. A Alexandriite cat's eyeball is a Chrysoberyl cat's eyeball that changes colour. "Dairy and Honey" is a word often used to describe the colour of the best cat's skin. Cats' eyestuff is found as a small percent of total chrysoberyl output wherever chrysoberyl is found.

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