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#3523
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Iolite 1.38 ct.
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Iolite
is a magnesium iron aluminium cyclosilicate with formula Mg2Al3O and hardness of 7-7.5.
Is the gem variety of the mineral cordierite also called “water sapphire”
It is famous for it's very strong pleocroism ( tricroism) , the changing colors depending of the light rays directions, in fact if you move the stones against the light you will see 3 distinct colors: blue/violet,yellow and also colorless.There is nice story regarding the vikings: they used this stone in order to navigate in the cloudy days,they were able to find out the sun position. Small inclusions.
From India.
Size:9.2x6.6x4 mm.
Weigth:1.38 ct.
CODE#3523
Origin | India |