Beryllonite is a rare mineral that is composed of beryllium, phosphate, and sodium. This mineral is typically found in granitic pegmatites and can often be used in gemstones and jewelry. However, there are some synonyms that can be used to describe beryllonite in a more general sense. These synonyms include beryllium phosphate, sodium beryllium phosphate, and sodium beryllium silicate. Other minerals that have similar chemical compositions to beryllonite include eucryptite, lithiophilite, and triphylite. Regardless of the name used to describe it, beryllonite remains an important mineral that is valued for its beauty and rarity.