Minerals

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General Information

Ruby

Ruby is the second hardest mineral, only moissanite and diamond are harder.[1]

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Chemical & Physical Information

Trivial NameRuby
Chemical NameAluminum Oxide
Chemical FormulaAl2O3,Cr
Density3,97-4,05 g·cm-3
Molar mass-
Hardness9,0
Crytal systemTrigonal
Unit cell?
Crystal habitDiffers, mostly hexagonal prisms
FractureUneven, Conchoidal
Cleavage?
ColourRed
LusterGlass
StreakWhite
OpacityOpaque to translucent.
SafetySafe
ExtraCan be produced synthetically.
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Photos

Ruby

(1 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.