Gallium hydroxide, Ga(OH)3, is the normal mineral form of gallium in the Earth's crust.
Gallium hydroxide is very rarely found as a discrete mineral called söhngeite. More commonly, gallium replaces aluminium in ores such as bauxite. Rich sources may contain almost 1% Ga replacing Al, but a more typical value is a hundred times less.
Gallium hydroxide is amphoteric. In strongly acidic conditions, the gallium ion, Ga3+ is formed. In strongly basic conditions, Ga(OH)4− is formed. Salts of Ga(OH)4− are sometimes called gallates.