Colourless corundum is worth very little, bu the red and blue forms are expensive.?

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Colourless corundum is worth very little, bu the red and blue forms are expensive.?

What are they and what causes the colours?

2006-11-05 18:46:45 · 2 answers · asked by Joey 2 in Science & Mathematics ➔ Earth Sciences & Geology

2 answers

The presence of titanium oxide in corundum turns it into blue sapphire. The presence of chromium turns it into red ruby.

Pure corundum is a translucent brown rock.

2006-11-05 19:04:26 · answer #1 · answered by Beckee 7 · 0⤊ 0⤋

magnesium and other minerals trapped in the stone.

2006-11-06 02:54:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋