Aminoffite

Aminoffite is a silicate with the chemical formula Ca₂(Be,Al)(Si₂O₇)(H₂O,OH). It crystallizes in the tetragonal system.^[4] Its hardness on the Mohs scale is between 5.5 and 6. According to the Nickel–Strunz classification, the aminoffite belongs to "09.BH - Sorosilicates with anions Si₃O₁₀, Si₄O₁₁, etc.; cations in tetrahedral coordination and greater coordination' along with the minerals kinoite, akatoreite, and fencooperite.

Aminoffites are found as well-formed crystals in veins and cavities in massive magnetite and limonite. It is usually found associated with other minerals such as: magnetite, goethite, fluorite, calcite and baryte. It was discovered in 1937 in Långban, Filipstad of Värmland, Sweden. It has also been found in the alkaline massif in Dugdu of Tuva in Russia and Taronga of New South Wales in Australia.