CaBePO₄(F,OH)

These samples of herderite are displayed in the Smithsonian Museum of Natural History. Herderite is a phosphate mineral of beryllium with fluorine and it has the composition CaBePO₄(F,OH). The sample at left is about 5 cm across and is from Gilgit, Northern Areas, Pakistan. The sample at right is from Fletcher mine, North Groton, New Hampshire. It is about 5 cm wide.

CaBePO₄(OH)

These samples of hydroxyl-herderite are displayed in the Smithsonian Museum of Natural History. Hydroxyl-herderite is herderite without the fluorine content or if the hydroxyl group is dominant over the fluorine. It is a phosphate mineral of beryllium with the composition CaBePO₄(OH). The sample at left is about 8 cm across and is from Virgem da Lapa, Minas Gerais, Brazil.

This sample of hydroxyl-herderite is from Minas Gerais, Brazil. The accompanying gem is 1.5 carats. The sample is about 8 cm wide.