31. This iron ore was previously mined between 1967 and 1974, and consists of haematite with some goethite and limonite . 32. "' Silicate type "'( or saprolite type ) nickel ore formed beneath the limonite zone. 33. Nickel content is higher in the saprolite zone although cobalt is an important by-product of the limonite horizon. 34. Calcareous siltstone is also present, along with minerals quartz, feldspar, muscovite, limonite , hematite and pyrite. 35. In another example the deeply weathered iron formations of Brazil served to concentrate gold with the limonite of the resulting soils. 36. This combination of iron oxide with water forms a resulting chemical compound called mineral limonite , which has a brown color. 37. Arppe was awarded a permission to build two furnaces in V�rtsil?for limonite processing, four power hammers and a workshop. 38. During the mid-to-late 19th century there was considerable iron-ore related mining and smelting of Limonite ore. 39. These ferric hydroxides commonly include goethite ( FeO-OH ) and so-called " amorphous ferric hydroxide " or limonite . 40. Fibrous blue-green rosasite crystals are usually found in globular aggregates, often associated with red limonite and other colorful minerals.
