Botryogen is a hydrous magnesium sulfate mineral with formula: MgFe3+(SO4)2(OH)·7H2O.

[3] It crystallizes in the monoclinic prismatic system and typically occurs as vitreous bright yellow to red botryoidal to reniform masses and radiating crystal prisms.

[4] It occurs in arid climates as a secondary alteration product of pyrite-bearing deposits.

[5] It was first described in 1828 for an occurrence in the Falu mine of Falun, Dalarna, Sweden.

This article about a specific sulfate mineral is a stub.