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RUBY MINERAL
NATURAL COLOR
Hardness
9 |
|
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. | | |
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Ruby, natural
tabular crystal 16.87
cts. / 19.3 x 16 x 4.4 mm.
( Deep red ) semi glossy |
SOLD
ref RUmita1687c
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