Tourmaline pegmatite
Part of Hall of Planet Earth.
All admission to the Museum is by timed-entry, and must be reserved online.
Part of Hall of Planet Earth.
The large groups of pink crystals of the boron-bearing mineral tourmaline and the tiny purple crystals of the lithium-bearing mineral lepidolite grew from a melt consisting of lithium, boron, and water-rich silicate.
AMNH collection