Agaite is the rarest mineral in the world, known from only one specimen of microscopic (0.2 mm), rhomboid, blue crystals.
Even though it is extremely rare and has a bright blue color and adamantine luster (like the Diamond), it can't be used as a gemstone because of its size and unknown Mohs scale hardness.
Not to be confused with Ajoite, a more common, also blue mineral.
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