Ilmenite is valued as an ore of titanium, selling a ton of ore on the basis of 59% to 60% titanic oxide, TiO2. Aluminium oxide, very hard, used as abrasive; Antimony trioxide, white solid; Antimony tetroxide, white solid; Antimony pentoxide, yellow solid, oxidizing agent; Arsenic trioxide, white solid, highly toxic; Arsenic pentoxide, white solid, highly toxic, oxidizing agent Ilmenite is used for making titanium metal, as well as ferro-titanium, employed in making steel, and for making titanium-white, a white pigment used for paints with great covering power and durability. Clear, finely colored crystals (amethysts) are classed as jewels. Toad’s eye tin is similar to wood tin. In some localities, as in Sweden, it is valued on account of its purity, being free from phosphorus and sulphur; but, because it is usually harder and less porous than hematite, the latter is preferred, as it is easier to melt. Its Mohs hardness is 6 … Crystals for fusing sell well. These are the minerals that are listed and described below. Manganese oxide minerals have been used for thousands of years—by the ancients for pigments and to clarify glass, and today as ores of Mn metal, catalysts, and battery material. Emery is usually black, fine-grained corundum, with magnetite or hematite; is sometimes hercynite, FeAlO4. Accessory (silicates) and Oxide Minerals Common accessory and metal oxide species are often valuable ore minerals or important phases for petrographic interpretation. Ilmenite or Titanic Iron Ore are in Color, iron-black, very much like magnetite; powder, black to brownish red; luster, near-metallic; H = 5 to 6; G = 4.5 to 5. Oxides Minerals . The composition is the same as that of hematite, with the addition of water (H2O). Very slightly magnetic, and thus distinguished from magnetite. Color, white, yellow, red, brown, green, gray, blue, sometimes with a fine play of colors (precious opal); H = 5.5 to 6.5; G = 1.9 to 2.3; not crystalline. Wad, or bog manganese is a brown, soft, earthy manganese ore, variable in composition ; it looks like bog iron ore, but is often darker, and is often found with pyrolusite. The finer specimens of agate, carnelian, bloodstone, onyx, etc. Post, J.E. Cassiterite is tin oxide, SnO 2, and the most important ore of tin. More recently its heat resistance has made it useful in parts of the jet engine. To test for magnetism, break off a number of small grains of the mineral, and bring the point of the magnetized knife blade to them slowly; if strongly magnetic, the grains will jump to the knife blade. Hausmannite, Mn3O4, is a similar mineral of brownish black color; powder, chestnut-brown; H =5 to 5.5; G=4.8. In composition, it lies between the two, having some water, but less than goethite. The magnetic property of minerals can be conveniently tested with a magnetized View All Minerals; View by Alphabetical Order ; Varieties and Other Names; Mineral Search; Filter Minerals. This page is a list of all oxides.Oxides are chemical compounds containing oxygen in an oxidation state of -2.. Metal oxides. Taking the specific gravity of the ore as 5, the number of cubic feet per ton is calculated as follows: weight of a cubic foot of water is 62.4 pounds; weight of a cubic foot of magnetite is 62.4 x 5 = 312 pounds; number of cubic feet to the ton is 2000 ÷ 312 = 6.41. This list may not reflect recent changes (). ), amethyst (purple of violet blue), rose quartz, false topaz (yellow), cat’s eye, tiger-eye, aventurine (spangled with scales of mica, hematite, etc. Laboratory Testing Consulting & Engineering Process Equipment. The formula as written above shows that there are 2 (56 x 2 +16 x 3) = 2 x 160 = 320 parts of hematite and 3 (1 x 2 + 16) =54 parts of water; and the proportion of the iron in the ore is 2 x 56 x 2/320 + 54 = 224/374 = .599 = 59.9%. Composition is the same as corundum, with water in addition; but generally more or less limonite is mixed with the bauxite, causing the brown color. Chrysoprase, apple-green chalcedony, color due to nickel oxide. Manganese is added in small quantities to ordinary steel up to 1%; more than this makes the steel brittle; but when the amount of manganese is increased to 7%, the properties of Hadfield steel begin to appear. Asbolite, or earthy cobalt ore, resembles wad, but contains cobalt, sometimes enough to make it a cobalt ore. Lampadite is a variety of wad containing 3% to 13% of copper. Found in rocks of all ages, in vast quantities in sedimentary rocks, and in smaller masses in igneous rocks. The four oxides hematite, ilmenite, magnetite and rutile are often found associated with each other. Jasper is the name given to a group of oxides that are part of the quartz family of minerals. It is also used in parts of machinery that have to withstand corrosion. Value, at a port near the furnace; but an ore low in phosphorus and containing 68% of iron is quoted higher. There are more silicates than all other minerals put together.The mica on the left is a member of this group. Alundum is artificial corundum made from bauxite by heating in electric furnaces. Corundum being harder than quartz is valuable as an abrasive (material for grinding and polishing). are also of considerable value. It is not likely to be found in glaciated countries. About 200 minerals are called the rock-forming minerals. disorder. Since Ontario produces an appreciable part of the world’s cobalt ores and Quebec has deposits of chromite, Canada has the raw materials for making stellite alloys, manufactured at Deloro, in eastern Ontario, since 1915. Crystals, in hexagonal system; parting, good, but no true cleavage. Manganese steel, or Hadfield steel, usually contains 12% to 15% of manganese. Braunite are of Color, brownish-black to steel-gray; powder the same; luster, near-metallic; H=6 to 6.5; G=4.75 to 4.82; crystals, tetragonal; cleavage, perfect; composition, oxides of manganese with some silica.