Additionally called
dichroite or iolite. blue silicate mineral that happens as crystals
or grains in igneous rocks. It usually happens in thermally altered
clay-rich sediments surrounding igneous intrusions and in schists
and Para gneisses. Precambrian deposits of the Laramie Range, Wyo.,
U.S., include greater than 500,000 tons of cordierite. Cordierite is
usually referred to as dichroite due to its marked pleochroism
(completely different coloured light is transmitted in numerous
directions). For chemical formula and detailed physical properties.
The pure mineral has little business use. When clear, cordierite is
usually cut as a gem; the stones from the gem gravels of Sri Lanka
have been known as water sapphires. Synthetic magnesium cordierite
has a low thermal enlargement and is used as a semirefractory
materials due to its resistance to thermal shock.
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