Cordierite

Cordierite is a mineral that is commonly of a blue color, although its color shifts depending on the angle it is observed from.

List of Cordierites

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a blue cordierite

Description:   The unusual color of a blue cordierite could be compared to a light blue sapphire with a purplish tint. Sometimes called a "water sapphire," cordierite has an entrancing color-changing ability. When seen from one direction, the crystal is a clear blue-violet. But as it is rotated, the color changes first to yellowish-grey, then back towards light blue.