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Answered 2012-08-29 20:29:46

Ruby is aluminium oxide; chromium is only a natural dopant, in traces. The concentration of chromium is not constant in rubies.

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Ruby is aluminium oxide (Al2O3) with chromium as an impurity.


The elements in a ruby are: Aluminium oxide Chromium


Ruby is aluminium oxide with traces of chromium.


The ruby's chemical composition is Al2O3, an aluminum oxide. The red color of a ruby, which is a kind of corundum, comes from chromium in it.


a variety of the mineral corundum (aluminium oxide). The common red color is caused mainly by the element chromium


Yes it's a gemstone variety of the mineral corundum (aluminium oxide). The red colour is caused by the presence of chromium.


Aluminium Oxygen and Chromium


A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide - Al2O3). The red color is caused mainly by the presence of the element chromium.


Ruby is not a chemical compound and so does not have a precise chemical structure. It consists mainly of Aluminium Oxide Al2O3, and also contains chromium which gives ruby its characteristic red or reddish brown tint.


Al2O3 and Cr ruby is a mixture of aluminum oxide and chromium


Ruby is mainly Aluminium oxide which has a boiling point of 2980 deg C


Both sapphire and ruby are a crystallized form of the compound aluminium oxide which is a good insulator.


Corundum, which is a form of Aluminum Oxide. The red color is caused by chromium in the corundum.


The two main elements present in a red ruby--aluminium and oxygen. This is actually the exact same main elements found in a sapphire, which has the same chemical composition but simply differs in colour which is caused by traces of a different elements (iron, titanium) which causes it to be blue versus a rubies red colour. The red colour of the ruby is due to traces of chromium in the aluminum oxide. Corundum (the aluminum oxide base of these gems) can be turned blue, yellow, pink, purple, orange, greenish or pink-orange by the impurities.


I just had to look this up for a science worksheet. Alumina or ruby.


A ruby is a pink to blood-red gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium.It is not a chemical compound with fixed ratios of elements, it is essentially Al2O3 with some Al3+ replaced by Cr3+


Ruby is mostly aluminum oxide with a bit of chromium. It has good thermal conductivity, but won't conduct electricity. A link can be found below for more information.


Ruby is almost pure aluminum oxide (Al2O3, corundum), which exists as an infinite lattice of atoms. The structures of Cr2O3 and Al2O3 are sufficiently similar that the aluminum atoms in corundum can be replaced with chromium atoms. The proportion of chromium atoms in rubies is relatively small, however - typically less than 2% - but those few atoms cause an alteration in the electronic structure of the corundum that leads to the red colour that is typical of ruby. There is a continuous composition of formula CrxAl2-xO3, from x=0 to x=2, which can be described as a solid solution of Cr2O3 in Al2O3. Ruby is a small part of this series, but that still makes it a solid solution. Alternatively, it can be described as Al2O3 with Chromium in partial occupancy at the Aluminium sites.


Ruby is almost pure aluminum oxide (Al2O3, corundum), which exists as an infinite lattice of atoms. The structures of Cr2O3 and Al2O3 are sufficiently similar that the aluminum atoms in corundum can be replaced with chromium atoms. The proportion of chromium atoms in rubies is relatively small, however - typically less than 2% - but those few atoms cause an alteration in the electronic structure of the corundum that leads to the red colour that is typical of ruby. There is a continuous composition of formula CrxAl2-xO3, from x=0 to x=2, which can be described as a solid solution of Cr2O3 in Al2O3. Ruby is a small part of this series, but that still makes it a solid solution. Alternatively, it can be described as Al2O3 with Chromium in partial occupancy at the Aluminium sites.


Sapphire and ruby are oxides of Aluminium Sapphire and ruby are oxides of Aluminium


Ruby is a Generation lll game. Diamond is a Generation IV game. They are set in different areas. Ruby is set in the Hoenn region, and Diamond, in the Sinnoh. Outside the world of Pokémon, ruby and diamond are gem stones. Diamond is a carbon crystal. Ruby is the mineral corundum (aluminum oxide) that has a red color because of the presence of chromium. Gem-quality corundum without chromium is called a saphire


Rubies are red gemstones that are a variation of the mineral aluminum oxide, also known as corundum. Chromium gives them their red color.


Ruby: aluminum oxide (Al2O3) doped with chromium. Garnets has the general formula X3Y2(SiO4)3 where: X is Ca2+, Mg2+, Fe2+, Mn3+, Y3+, Gd3+ and Y is Al3+, Fe3+, Cr3+


Ruby is essentially just the compound aluminum oxide (Al2O3) doped with chromium (which makes it red). The Cr3+ ions occupy only a very small percentage of the Al3+ positions in the crystal lattice, so the molar mass of ruby is essentially the same as aluminum oxide: 2 (26.98) + 3 (16.00) = 101.96 grams / mole


The chemical composition of ruby is aluminum oxide (Al 2 O3). Its specific gravity is 3.99 to 4.00 and refractive index range is 1.760-1.768 to 1.770-1.779. Ruby's hardness on Mohs scale is 9. It's the next hardest mineral after diamond.



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