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Magnetite is a mineral, one of the two common naturally occurring iron oxides (chemical formula Fe3O4) and a member of the spinel group. Magnetite is the most magnetic of all the naturally occurring minerals on Earth.[6] Naturally magnetized pieces of magnetite, called lodestone, will attract small pieces of iron, and this was how ancient people first noticed the property of magnetism.
Small grains of magnetite occur in almost all igneous and metamorphic rocks. It is black or brownish-black with a metallic luster, has a Mohs hardness of 5-6 and a black streak.
The chemical IUPAC name is iron(II,III) oxide and the common chemical name is ferrous-ferric oxide.
Lodestones were used as an early form of magnetic compass. Magnetite typically carries the dominant magnetic signature in rocks, and so it has been a critical tool in paleomagnetism, a science important in understanding plate tectonics and as historic data for magnetohydrodynamics and other scientific fields. The relationships between magnetite and other iron-rich oxide minerals such as ilmenite, hematite, and ulvospinel have been much studied; the reactions between these minerals and oxygen influence how and when magnetite preserves a record of the Earth's magnetic field.
Magnetite has been very important in understanding the conditions under which rocks form. Magnetite reacts with oxygen to produce hematite, and the mineral pair forms a buffer that can control oxygen fugacity. Commonly, igneous rocks contain grains of two solid solutions, one of magnetite and ulvospinel and the other of ilmenite and hematite. Compositions of the mineral pairs are used to calculate how oxidizing was the magma (i.e., the oxygen fugacity of the magma): a range of oxidizing conditions are found in magmas and the oxidation state helps to determine how the magmas might evolve by fractional crystallization.
Magnetite also occurs in many sedimentary rocks, including banded iron formations. In many igneous rocks, magnetite-rich and ilmenite-rich grains occur that precipitated together in magma. Magnetite also is produced from peridotites and dunites by serpentinization.
The Curie temperature of magnetite is 858 K (585 °C; 1,085 °F).
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If a 60 kg granite boulder were broken down into sand grains and if quartz made up 35 percent of the boulders mass how many kilograms of the resulting sand would be quartz grains?
35% of 65kg. Total mass does not change regardless of how many pieces the object is broken into
What minerals are common in both felsic and marfic igneous rocks?
Biotite and muscovite micas, quartz, magnetite, olivine, amphiboles, and feldspars.
What mineral can scratch fluorite?
the answer is something harder than fluorite some examples are granite , magnetite , diamonds , and quartz .
How do you separate grains and stalks?
You can separate grains and stalks by threshing, which involves beating the harvested crop to remove the grains from the stalks. Afterwards, winnowing can be used to separate the lighter chaff from the heavier grains by allowing the wind to blow away the chaff while the grains fall back down.
What rock is composed mainly of quartz and quartz sand?
rock salt and conglomerate
What has quartz in it?
Most sand grains are of quartz.
What are 8 examples of minerals?
Diamond, graphite, quartz, topaz, calcite, fluorite, dolomite, magnetite, hematite, pyrite...
If a 60 kg granite boulder were broken down into sand grains and if quartz made up 35 percent of the boulders mass how many kilograms of the resulting sand would be quartz grains?
35% of 65kg. Total mass does not change regardless of how many pieces the object is broken into
What minerals are common in both felsic and marfic igneous rocks?
Biotite and muscovite micas, quartz, magnetite, olivine, amphiboles, and feldspars.
What mineral can scratch fluorite?
the answer is something harder than fluorite some examples are granite , magnetite , diamonds , and quartz .
What mineral scratches fluorite?
the answer is something harder than fluorite some examples are granite , magnetite , diamonds , and quartz .
What is the minerals of sandstones?
Mostly quartz grains, sometimes feldspars.
Quartz and potassium feldspar grains are the main constituents of which rock?
Granite is the rock composed mainly of quartz and potassium feldspar grains.
How do you separate grains and stalks?
You can separate grains and stalks by threshing, which involves beating the harvested crop to remove the grains from the stalks. Afterwards, winnowing can be used to separate the lighter chaff from the heavier grains by allowing the wind to blow away the chaff while the grains fall back down.
What mineral are most sand grains made of?
Most sand grains are made of quartz, also known as silica or silicon dioxide.
What is the grain size of quartz?
Quartz typically has a fine to medium grain size, with individual grains ranging from a few millimeters to a few centimeters in size. However, quartz can also occur as very fine grains in some sedimentary rocks.
The difference between quartzite and quartz is that in quartzite the grains have been?
The difference between quartzite and quartz is that quartzite is a metamorphic rock formed from sandstone under heat and pressure, while quartz is a mineral composed of silicon and oxygen. In quartzite, the grains of sandstone have been recrystallized into a interlocking mosaic of quartz crystals, giving it a more durable and non-porous nature compared to quartz.
