Amarantite is an amaranth-red to brownish mineral with the general formula of Fe3+2O(SO4)2·7H2O[2][3] or Fe3+SO4(OH)·3H2O.

[4] The name comes from the Greek word αμάραντος which means amaranth, an imaginary undying red flower, in allusion to its color.

[5] Amarantite is anisotropic,[3] which means, the velocity of light varies with crystallographic direction, and there is more than one refractive index.

[6] Amarantite is a very rare mineral and can only be found in a couple of places such as Carocoles, Chile.

However, when found in crystal form its red orange color gives it value as a collectors item.