Limonite is a mineral which has a brown (sometimes banded) earthy appearance and texture. It is also one of the 2 major sources of iron ore (the other being hematite) and is sometimes referred as 'brown hematite'. The mineral specimens we offer are fairly dense as expected and can often contain varying coloured bands of brown to yellow. Formed from the hydration of hematite and magnetite, limonite has historically been used as a colour pigment in paint. These particular samples come from the famous Cooper Peedy deposit in Australia and so may contain small occurrences of blue opal, available in various sizes and supplied in a card tray with an information label.