These elbaite crystals are colorless at the tips because the supply of iron impurities decreased while they grew. Manganese impurities incorporated during early stages of growth and colored the interiors pink. The chemical composition of elbaite is Na(Li,Al)3Al6(BO3)3Si6O18(OH)4.
Image Number: 97-35203
Catalog Number: R17521
W. A. Roebling
Locality: Santa Rosa Mine, Minas Gerais