minette is a type of mineral deposit, consisting of iron ore of sedimentary origin, found in the south of luxembourg and in lorraine. minette ore was deposited in the early jurassic and middle jurassic. the term 'minette' came from french miners. it is a diminutive form of 'la mine', and might be translated as 'little mine, little colliery' or .
some mineral deposits are associated with an increase or decrease in the abundance of magnetic minerals, and occasionally the sought after commodity may itself be magnetic e.g. iron ore deposits , but often the elucidation of the subsurface structure of the upper crust is the most valuable contribution of the aeromagnetic data. it has also .
magnetite is a rock mineral and one of the main iron ores, with the chemical formula fe 3 o 4. it is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. it is the most magnetic of all the naturally-occurring minerals on earth.
a magnet made of alnico, an iron alloy, with its keeper. ferromagnetism is the basic mechanism by which certain materials such as iron form permanent magnets, or are attracted to magnets. in physics, several different types of magnetism are distinguished.
it is mined as the main ore of iron. varieties include kidney ore, martite pseudomorphs after magnetite , iron rose and specularite specular hematite . while these forms vary, they all have a rust-red streak. hematite is harder than pure iron, but much more brittle. maghemite is a hematite- and magnetite-related oxide mineral.
many of the most important magnetic minerals on earth are oxides of iron and titanium. their compositions are conveniently represented on a ternary plot with axes corresponding to the proportions of ti 4 , fe 2 , and fe 3 . important regions on the diagram include the titanomagnetites, which form a line of compositions fe 3-x ti x o 4 for x between 0 and 1.