Fluorite 8x16mm Faceted Tube - 17-18 Inch Stone Type_Fluorite followed by a mild heat

followed by a mild heat treatment gives it the bright yellow color

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It may also contain rainbow to colored or sparkling inclusions

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The different colored zones in the stone result from different oxidation states of iron

Fluorite 8x16mm Faceted Tube - 17-18 Inch Stone Type_Fluorite followed by a mild heatFluorite is a luminous, soft and glassy stone, sometimes referred to as the most colorful mineral in the world. It is one of the most sought to after minerals among gem and mineral collectors, second only to Quartz. The term fluorescent was inspired by Fluorite, one of the first fluorescent minerals ever studied. It is frequently fluorescent under ultraviolet light, and this phenomenon is thought to be due to impurities of yttrium or organic matter