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Iolite


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Iolite
   is coloured   
Blue
Cordierite (mineralogy) or iolite (gemology) is a magnesium iron aluminium cyclosilicate. It is a transparent, violet-blue, light blue, blue, rich blue-violet stone, less commonly it can be yellow.
Prasiolite
   is coloured   
Green
Also known as green-quartz or vermarine. It is a green form of quartz. It is usually produced artificially by heat-treating amethyst.






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