Ruby

Ruby
Ruby
	A ruby gemstone
General
Category	Corundumvariety,Oxide mineral
Formula; (repeating unit)	aluminium oxidewithchromium,Al2O3
Identification
Color	Red shades
Luster	Vitreous
References

Arubyis a kind of precious stone. It is often associated withemerald,sapphireandtopaz.^[1]It is usually red, but can sometimes be other colors.^[1]It is formed ofaluminumandoxygen(Al₂O₃),^[1]and that means it's a kind ofcorundum.A small amount ofchromiummakes the color. They are the most popular red gemstone, and is aften linked with the birthmonth of July.

References

↑^1.0^1.1^1.2^1.3"Ruby at Mindat".Mindat.org.Retrieved23 August2013.

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[Mindat-1] 1.0^1.1^1.2^1.3"Ruby at Mindat".Mindat.org.Retrieved23 August2013.

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