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RUBY MINERAL              NATURAL COLOR             Hardness 9
 

 

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Corundum is composed of pure alumina; its colouring is due to metallic

oxide traces or inclusions. The color of ruby is due to chromium oxide.
Gems are generally found in alluvium, but come either from basaltic slags, or from metamorphic marble.
Ruby, natural tabular crystal (translucent) 15.93 cts. / 20 x 17 x 3.5 mm.  ( Deep red ) semi glossy
USD 58 .00 

ref RUrs1593c

 

Hardness: 9 Ruby discovery
Specific Gravity: 3.9 - 4.1
Refractive Index: 1.76 - 1.78 Corundum data
Chemical Composition: Al2O3, Aluminum Oxide   Ask a question
Crystal Structure: Trigonal
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