Class : Carbonates, nitrates, borates
    Subclass : Borates
    Crystal system : Hexagonal
    Chemistry : Al₆B₅O₁₅ (F,OH)₃
    Rarity : Very rare

Jeremejevite (or jeremejewite) is a very rare borate which was described for the first time in Siberia on Mount Soktuj by the Russian mineralogist Pavel Vladomirovich Jeremejev. Its color varies from blue to yellow-brown but it is often colorless. The crystals are prismatic with hexagonal sections  and sometimes flattened. It is a mineral that is found in pegmatites or volcanic ejecta. It is not used in industry, specimens are for collection, jeremejevite is also highly sought after by mineral collectors. It should be noted that it can be cut and faceted sometimes is encountered in completely transparent crystals with very few inclusions. Gemstones are also produced for the collection, the pale blue is not sufficiently attractive to jewelery industries.

Jeremejevite is not present in the French underground.

Jeremejevite has no twinned crystals known.

Some specimens on matrix in the mineral market have been assembled. These assemblies are sometimes done with dental cement resistant to acetone, if the assembly is well built, it can be difficult to detect. Jeremejevite crystals can also be easily confused with beryl (especially aquamarine) whose shape is very close, especially if the crystal has a flat termination or if termination is absent... Small pieces of aquamarine crystals can be sold for jeremejevite by dishonest dealers.