“magnetite”的概念、定义、翻译、参考文献-科学参考

magnetite

Chemistry

A black mineral form of iron oxide crystallizing in the cubic system. It is a mixed iron(II)-iron(III) oxide, Fe₃O₄, and is one of the major ores of iron. It is strongly magnetic and some varieties, known as lodestone, are natural magnets; these were used as compasses in the ancient world. Magnetite is widely distributed and occurs as an accessory mineral in almost all igneous and metamorphic rocks. The largest deposits of the mineral occur in N Sweden.

Biology

A strongly magnetic mixed iron oxide, Fe₃O₄, postulated to be part of the magnetoreceptor in some birds and other animals.

Geology and Earth Sciences

An important rock-forming iron oxide Fe²⁺Fe³⁺₂O₄ (FeO.Fe₂O₃) and member of the spinel group of minerals; belongs to the magnetite series along with magnesioferrite (MgFe³⁺₂O₄), franklinite, jacobsite (MnFe³⁺₂O₄), and trevorite (NiFe³⁺₂O₄); sp. gr. 5.2 (to 4.6); hardness 5.5–6.5; cubic; normally iron-black with a blue tarnish; black streak; sub-metallic lustre; crystals often octahedral and rhombododecahedral, but it is also massive and granular; cleavage poor, octahedral; strongly magnetic; found extensively in magmatic rocks associated with basic rocks, in pegmatites, in contact metasomatic zones (especially in limestones in regionally metamorphosed rocks due to the dehydration of iron hydroxides), and also in black sands associated with gold gravels.

单词	magnetite
释义	magnetite Chemistry A black mineral form of iron oxide crystallizing in the cubic system. It is a mixed iron(II)-iron(III) oxide, Fe₃O₄, and is one of the major ores of iron. It is strongly magnetic and some varieties, known as lodestone, are natural magnets; these were used as compasses in the ancient world. Magnetite is widely distributed and occurs as an accessory mineral in almost all igneous and metamorphic rocks. The largest deposits of the mineral occur in N Sweden. Biology A strongly magnetic mixed iron oxide, Fe₃O₄, postulated to be part of the magnetoreceptor in some birds and other animals. Geology and Earth Sciences An important rock-forming iron oxide Fe²⁺Fe³⁺₂O₄ (FeO.Fe₂O₃) and member of the spinel group of minerals; belongs to the magnetite series along with magnesioferrite (MgFe³⁺₂O₄), franklinite, jacobsite (MnFe³⁺₂O₄), and trevorite (NiFe³⁺₂O₄); sp. gr. 5.2 (to 4.6); hardness 5.5–6.5; cubic; normally iron-black with a blue tarnish; black streak; sub-metallic lustre; crystals often octahedral and rhombododecahedral, but it is also massive and granular; cleavage poor, octahedral; strongly magnetic; found extensively in magmatic rocks associated with basic rocks, in pegmatites, in contact metasomatic zones (especially in limestones in regionally metamorphosed rocks due to the dehydration of iron hydroxides), and also in black sands associated with gold gravels.
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