Sapphirine

Sapphirine, when used as an adjective, compares something to the gemstone sapphire, mostly in color. Furthermore, it can also refer to something consisting of sapphire.

A sapphire is normally a blue, transparent gemstone.

As a noun, it refers to either a mineral consisting of magnesium silicate and aluminium, which has typically a blue or green color, or to a blue variety of spinel.

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