Falcondoite, a member of the sepiolite group, was first discovered in the Dominican Republic, near the town of Bonao.
[4][5] Falcondoite is a whitish-green to green colored translucent mineral with a resinous luster and a white streak.
[2][3] It occurs as aggregates of microscopic, fibrous crystals that are typically smaller than 10 μm in size, which have a refractive index of less than 1.55.
[4] Falcondoite is considered to be a variety of clay-like, nickel-bearing hydrous silicate, which is a common component of garnierite mineralization.
Some of the measured peaks end up broadened possibly due to poor crystallinity, so accurate d-values were difficult to obtain.