What is the chemical formula for amethyst?

Answer 1

Sapphire without any color refers to the blue variety of the mineral corundum, which also includes rubies as both sapphires and rubies are the same minerals and the only difference between the two is color. The chemical formula for sapphires is Al2O3, it has a refractive index of 1.76 - 1.77, a melting point of 2,030–2,050 °C and a crystal system of trigonal, symbol (32/m) space group R3c.

Answer 2

Sapphire (corundum) is a blue colored gemstone of aluminum oxide, Al2O3 ,

but it might contain also some trace elements giving it some color shine, like:

Fe (blue),

Ti (yellow),

Cr (purple, pink or when its color is red it's called a 'ruby'),

Cu (orange),

Mg (greenish)

Answer 3

The chemical formula of amethyst is SiO2, silicon dioxide. Amethyst is a type of quartz and is usually light purple.

Answer 4

Sapphire is made of mostly Aluminium oxide(Al2O3), along with some Iron(Fe) and Titanium(Ti) impurities, which give the bluish colour to it.

Answer 5

Sapphire is an aluminum oxide (Al2O3) doped naturally with Fe, Ti or Cr; these metals in traces are the cause of the sapphire colour.

Answer 6

Sapphires are made of corundum. It's blue color is a result of the presence of iron and titanium in the stone.

Answer 7

Sapphires are all basically corundum, with trace minerals to add all the different clors. Though we basically see only blue , they come in all colors, and the red ones are rubies.

Answer 8

The chemical formula for amethyst is SiO2, which represents silicon dioxide, or quartz. Amethyst gets its purple color from trace amounts of iron in the crystal structure.

Answer 9

Al2O3