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Corundum is a
crystalline form of
aluminium oxide (Al2O3)
typically containing traces of iron, titanium, vanadium, and chromium. It is a rock-forming mineral...
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Sapphire is a
precious gemstone, a
variety of the
mineral corundum,
consisting of
aluminium oxide (α-Al2O3) with
trace amounts of
elements such as iron...
- For example, ruby is the red
variety of the
species corundum,
while any
other color of
corundum is
considered sapphire.
Other examples are the emerald...
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Corundum is the name for a
structure prototype in
inorganic solids,
derived from the
namesake polymorph of
aluminum oxide (α-Al2O3).
Other compounds, especially...
- point.
Corundum is the most
common naturally occurring crystalline form of
aluminium oxide.
Rubies and
sapphires are gem-quality
forms of
corundum, which...
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ordinal scale. For example,
corundum (9) is
twice as hard as
topaz (8), but
diamond (10) is four
times as hard as
corundum. The
table below shows the comparison...
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mineral corundum (aluminium oxide). Ruby is one of the most po****r
traditional jewelry gems and is very durable.
Other varieties of gem-quality
corundum are...
- The name is also
often used
erroneously to
describe synthetically-grown
corundum that
simulates the
appearance of alexandrite, but with a
different mineral...
- century, the word ruby was only used for the red gem
variety of the
mineral corundum, and the word
spinel came to be used. "Balas" is
derived from Balascia...
- or
another are not
large enough, the
mineral will not
display cleavage.
Corundum, for example,
displays no cleavage.
Cleavage forms parallel to crystallographic...
