Nekoite is a triclinic, white silicate mineral consisting of calcium, silicon, oxygen and water. Its discovery was first published in 1956.
Its name derives from reversing "Oken" from Okenite (named after the German naturalist Lorenz Oken), which it was originally mistaken for due to their similar appearances.
This translucent crystal is described as having a pearl white color. It is also said to have a vitreous (glass-like) lustre.
Nekoite is a very rare mineral, but has been found in Landsman Camp in Arizona; Crestmore Crestmore Heights in California; Koch-Bulach in Uzbekistan; and Caxias do Sul in Brazil.
It is featured in Stardew Valley as a minor item obtained from geodes.