Hydrous sesquioxide of iron, an important ore of iron, occurring in stalactitic, mammillary, or earthy forms, of a dark brown color, and yellowish brown powder
One of the major iron minerals, a hydrous ferric oxide of variable composition. Often brown and earthy, it is formed by alteration of other iron minerals, such as the hydration of hematite or the oxidation and hydration of siderite or pyrite
A native hydrous ferric oxide of variable composition that is a major ore of iron Occurs most often as soft, yellowish-brown to reddish-brown fine-grained earthy masses or compact lumps or pellets It is a common and durable cementing agent in sedimentary rocks and the major component of laterite
- called "brown hematite"; a hydrated ore mineral of iron with a variable composition (iron2oxygen3hydroxyl) that causes a range of color (brown/yellow/orange)