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.

At left is an extraordinary trio of gems displayed at the Smithsonian Museum of Natural History. The center gem is hydroxyl-herderite , 161.08 carats, from Brazil, perhaps the finest gem of its kind with its size and deep green color. The 40.1 carat elbaite gem shown at the left of the trio is from Mozambique as a part of a recent gem discovery with an unusual color for elbaite. On the right of the gem trio is a 15.93 carat grossular gem of variety tsavorite from Kenya.