Tectosilicates

Danburite is a calcium boron silicate mineral with a chemical formula of CaB2(SiO4)2.

Bicchulite has an ideal chemical formula of , which was formularized from the hydrothermal synthesis of synthetic gehlenite (). Also, bicchulite was sighted in the mines of Japan with related minerals. This sodalite-type structured bicchulite has an uncommon ratio of aluminium to silicon, causing difficulties deciphering the structure. Because of bicchulite's structure it has a powdery texture, which leads to complications in obtaining information on the mineral's physical properties. Despite this problem, the color, specific gravity, and crystal size of bicchulite are known. Although bicchuli