Sample of sapphire

Sample of sapphire

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Credit: ARNOLD FISHER/SCIENCE PHOTO LIBRARY

Caption: Sample of sapphire. Sapphire is a form of corundum (aluminium oxide), with a colourless or blue colour. Corundum is an accessory mineral of igneous rocks which are under-saturated with respect to silica, or in high-grade metamorphic rocks poor in silica and rich in aluminium (eg marble). Clear, coloured varieties of corundum are highly-prized as gemstones. Red coloured corundum is known as ruby, green coloured corundum is known as emerald. This sample was found in Sri Lanka.

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Keywords: corundum, crystal, earth science, geology, mineral, precious stone, sapphire

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