CHEMICAL COMPOSITION OF GEMSTONES THE COLOURS OF GEMSTONES ARE AFFECTED BY DIFFERENCES IN CHEMICAL AND ATOMIC STRUCTURE LEADING TO THE ABSORPTION OF DIFFERENT WAVELENGTHS OF LIGHT THEIR HARDNESS IS MEASURED ON THE MOHS SCALE WHICH RUNS FROMO-30 AQUAMARINE ALEXANDRITE AlBeo AMETHYST DIAMOND sio Hardness 70 Their colour is caused by iron 3 BeAlSiO Hardness 75-80 C Hardness 85 Hardness 10 Colouriess can be faintly coloured by the trapping of nitrogen atoms in the crystal Colour caused by chromium lons Colour varies in different light Colour caused by iron 23+ ions replacing aluminium ions in some locations in the structure replacing aluminiumin some sitesons replacing silicon in some locations in the structure EMERALD BeAlSiO GARNET MgAlSio PEARL OPAL SionHO Hardness 55-60 Сасо Hardness 65-75 Hardness 25-45 Producedinthe softiue of shelled molluscs The thinner the layers of the peart the finer the lustre Hardness 75-8O Colour caused by iron 2 lons replacing magnesium lons in some locations in the structure Many colours which are caused by interference & diffraction of ight passing through the structure Colour caused by chromium lons replacing aluminium in some locations in the structure SAPPHIRE PERIDOT RUBY SPINEL AlO Hardness 90 ALO Hardness 90 Mgsio MgALO Hardness 75-80 Hardness 65-70 Colour caused by ron 2- ions Colour caused by chromium ions Colour caused by titanium and replacing magnesium ions in some locations in the structure A variety of colours are possible caused by impurities such as iron chromium and nickel oplacing aluminium ions in someron ions replacing akuminium ions locations in the structure in some locations in the structure TOURMALINE NaLiAlBOSIOF Meme

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sites

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magnesium

lithium

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iron

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silicon

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alexandrite

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pure

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scale

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ight

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found ON 2019-10-13 01:58:22 BY loveforquotes.com

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