Adelite is a rare mineral. It is a calcium, magnesium, arsenate with chemical formula CaMgAsO4OH. Adelite was named from the Greek word for indistinct.
It can be blueish-gray, green, gray, yellow, or light green in color. It is made of crystals. Adelite is not radioactive. It is scratched easily with apatite.
The mineral was first described in 1891 in Värmland, Sweden. It can be found in Flipistad, Sweden.