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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...
- point.
Corundum is the most
common naturally occurring crystalline form of
aluminium oxide.
Rubies and
sapphires are gem-quality
forms of
corundum, which...
- 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...
- USS
Corundum (IX-164), a Trefoil-class
concrete barge designated an
unclassified miscellaneous vessel, was the only ship of the
United States Navy to be...
-
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...
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present in
corundum crystals (aluminium oxide)
cause them to be
colored red; when
corundum appears as such, it is
known as a ruby. If the
corundum is lacking...
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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.[citation needed] The table...
-
Archaic Period. The
island is
famous as a
source of emery, a rock rich in
corundum,
which until modern times was one of the best
abrasives available. The...
