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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“God has no better way to make us value his love, than by withdrawing it awhile. If the sun shone but once a year, how it would be prized!”
–Thomas Watson, A Divine Cordial