Chemical composition of emerald

Answer 1

• Emerald chemical composition: Be3Al2(SiO3)6
• Class: cyclosilicates
• Crystal system: hexagonal; 6/m2/m2/m
• Crystal habit: typically small elongate first order prisms, often with vertical striations and irregular pinacoidal terminations
• Specific gravity: 2.67 - 2.78
• Index of refraction: 1.566 - 1.602
• Birefringence: 0.005 - 0.008
• Pleochroism: distinct, blue-green/yellow-green
• Hardness: 7.5 - 8.0
• Color: deep green, can have slightly yellowish or blueish tones
• Luster: vitreous
• Transparency: translucent to opaque, very rarely transparent
• Cleavage: poor basal cleavage is seldom visible on {0001}
• Fracture: conchoidal producing smooth brilliant surfaces, brittle
• Streak: white

Answer 2

Emerald is a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium.

• Beryllium
• Aluminum
• Silicon
• Oxygen
• Chromium
• Vanadium

Answer 3

Emerald is neither molecular or has an exact formula. It is "beryl" mineral with chromium and perhaps vanadium that give color. Beryl has complex structure with a formula Be3Al2(SiO3)2 which is best described as containing a beryllium -silicon network ion balanced by Al3+. The replacement of Al3+ by Cr3+ up to 30 % by weight gives the color. (CR£+ is transition metal ion with d electrons that can be excite by light. The Cr3+ is coordinated by O atoms from the framework ion that cause the splitting of the d orbitals.)

Answer 4

Emerald chemical composition: Be3Al2(SiO3)6

Answer 5

Emeralds/Aquamarines are known as the mineral Beryl, Beryl is a mineral containing the metal Beryllium, Aluminium and Silicon with Oxygen (It is a silicate)

Answer 6

Copper(II)-acetoarsenite

Answer 7

Al2Be3

Answer 8

Unknown