The name limonite is used for many yellow to tan iron oxides that are the result of weathering of rocks or iron-bearing sediments. Researchers studying limonite found that the mineral is amorphous and has a variable composition. They found that limonite is a pseudo mineral composed mostly of hydrous iron oxide, often found along with other iron-bearing minerals. Limonite cannot be detected in hand samples, and its quantity cannot be determined without detailed testing. Limonite is generally regarded as a secondary mineral and is the result of weathering of iron-bearing minerals such as hematite, magnetite, and pyrite. 
This mineral usually occurs as stalactites, spheres, and clusters. Limonite is also seen as a coating on rock crevices and cave walls. Some limonite's are found in layered sediments, in which hydrated iron oxides are the result of deposition on the bottom of swamps, lakes, and neritic environments. This process can be of abiotic or biotic origin. Limonite is also sometimes the result of deposition in springs and mines where iron-rich acidic water enters the complex from below the surface. Many groundwaters contain small amounts of oxygen, and when they reach the surface, they collide with oxygenated water. The iron dissolved in the groundwater quickly combines with the oxygen in the surface water, resulting in layer-by-layer settlement. These deposits are indicators of mining acid emissions. 
Limonite minerals are resistant to weathering and are usually deposited as sediments. Limonite is the predominant form of iron in laterites and is responsible for soil color. Limonite is tawny in color and has a dull to earthy sheen. The hardness of this mineral is based on a degree of weathering between 1 and 5. The specific gravity of limonite varies between 2.7 and 4.3, depending on the number of impurities. It is important to note that the crystal structure of this mineral is amorphous to the hidden crystals. Application of Limonite has been utilized by individuals since ancient times. Their to begin with utilize of limonite was likely as a shade. Throughout history, the yellow-to-brown color of limonite, also known as ochre, has been considered one of the most important pigments used to create paintings. This mineral is still used today as a pigment. This mineral is sometimes extracted directly from sediments and rarely processed. But it is usually heated to remove moisture from its structure and used to produce toner. Limonite has also been mined as low-quality iron ore for thousands of years. The mining of limonite as iron ore has been phased out since hematite and magnetite deposits were noticed. Limonite is also found in construction stone. 
The chemical composition of granite usually contains iron, which becomes hematite and limonite after chemical weathering. The yellow color of granite is due to the presence of hematite and limonite minerals in this stone. Limonite is relatively dense, with a specific gravity of 2. 7 to 4.3. Its color varies from bright lemon yellow to gray, brown. The veins of this iron ore are a feature that distinguishes them, e. g., limonite veins (earth color) are always brown, hematite has red veins, and magnetite has black veins. The hardness of limonite varies but is generally between 4 and 5.5 Although limonite was originally defined as a single mineral, it is currently referred to as an assemblage of iron oxide minerals such as: goethite, ekjanite, lipdocrosite and jarosite. Individual minerals in limonite can form crystals, but usually do not, while specimens may show fibrous or microcrystalline structures. Limonite usually exists in assemblage or in compact and earthy forms, such as grape, kidney or star forms. Due to its amorphous and amorphous nature and due to its presence in hydrated regions, limonite usually occurs in the form of clay or mudstone. However, pseudolimonite is also found in other minerals such as pyrite. Pseudo-limonite's are composed of other iron oxides, such as siderite carbonates, and iron-rich silicates, such as garnet, hematite, and magnetite. Limonite is formed in different ways, for example: from the hydration of hematite and magnetite, from the oxidative hydration of iron-rich sulfide minerals, or from other rich olivine, pyroxene, amphibole, etc. Formed by chemical weathering of iron minerals., and biotite. This iron ore is usually the main component of iron in laterite soils and is often deposited in runoff from mining operations. 
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