Ferroaxinite

Ferroaxinite is assigned the general formula Ca2FeAl2(BO3OH)(SiO3)4. This sample is from Vitoriado Conquista, Bahia, Brazil and is on display in the Smithsonian Museum of Natural History. The sample size is about 5 cm.

The sample above left is about 5x8 cm and is from Toruku mine, Miyazaki, Japan. It is classified as ferro-axinite with danburite. The sample above right is about 5x3 cm and is from Obira mine, Oita, Japan.

The sample above is about 2x3 cm and is from Switzerland. The sample at right is ferro-axinite with prehnite. It is about 9x9 cm and is from Riverside, California.

The sample above left is about 6x5 cm and is from Puiva, Tyumen Oblast, Urals, Russia. It is classified as ferro-axinite with calcite. The gems at right are 23.6 and 9.3 carats and are from Baja California, Mexico.