Cabochon Beryl Emerald  (2.645 Cts. or 529 Grams)
Channel: GMInternational
Date: 2019-04-20

Cabochon Beryl Emerald  (2.645 Cts. or 529 Grams)

EMail:gminternational18@gmail.com 

Name Beryl
Group: Silicate/cyclosilicate
Crystal System: Hexagonal
Composition: Be3Al2Si6O18
Color: Green, Blue, Yellowish
Form/Habit: Prismatic
Hardness: 7 1/2 - 8
Cleavage: Indistinct
Fracture: Uneven to Conchoidal
Luster: Vitreous
Streak: White
Specific Gravity: 2.6 -2.8
Transparency: Transparent to Translucent.
R.I. 1.57 -1.58

Beryl is known to be formed in by a prismatic crystal that resembles it as emerald or aquamarine as it's principal gem stone verities. These crystallized formations can also sometimes be formed in a pyramid shape which are striated parallel to their length, and may also sometimes be of vast in size. It can also form in a massive compact or columnar habits which are mainly found in granite, or granitic pegmatites, and rhyolites, but can also occur in metamorphic rocks, such as schist. Much of the emerald color is known to be mainly decomposed by traces of chromium, and in some cases vanadium. 
Beryl in many cases may be colorless, white, green, yellow, pink, red, and blue. It's rather known to also fuse difficultly, which rounds the edges of small fragments. Other areas where it may occur can included mica schist formations, within the Ural Mountains, and within the limestone formations of Columbia. Beryl it self is also mainly formed by the association of tin and tungsten ore-bodies.

Beryl is known to also be composed of beryllium aluminum cyclosilicate with a chemical formula of Be, AL, Si O). For the most part two varieties of beryl are commonly known to include emerald and aquamarine which its crystals are mainly hexagonal in shape. But terminated crystals such as tourmaline are extremely rare in the formation of Beryl. In several cases pure beryl is classified as colorless but may also be tinted by other minerals such as chromium, and vanadium to decompose another color. Beryl can also be found in several countries around the world like Brazil, Columbia, Madagascar, Mozambique, Europe, Norway, Austria, Germany, Sweden, Russia, and Ireland,. Some of the largest beryl crystals are commonly known to be found in New England within pegmatite formations. 

Beryl also has its own cleavage that can only be seen under a microscope as it shows structural breaks within its crystal formation. Much of the identifications of cleavages are mainly determined by its direction and angles between them in order to provide clues to identification. In several case the crystallization in beryl is known to be formed in a hexagonal shape just like apatite. Beryl is also prismatic crystal which produces sometimes long prismatic crystals which are inhabited by it's formation. Other times beryl can also be formed within lepidolite which contains a small portion of mica with a substantial portion of lithium that makes its the earths common lithium bearing material. Lepidolite is also one of the world oldest rock type that is known to be older than 10 million years. Not to mention beryl is also a cyclosilicate which gets its determination from a phrase known as cyclo, that means circle. These terms are known to be gathered due to the crystal that consist of closed ring like circles of tetrahedra which share corners. Each of these tetrahedrons are known to also share two of its oxygen atoms with other tetrahedra.