Iolite. A silicate of alumina, iron and magnesia, having a bright blue color and a vitreous or glassy luster. It is remarkable for its dichroism, and is also called dichroite.

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“But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self–control. Against such things there is no law.”
– Galatians 5:22-23