Magnetite,iron oxide,is one of the most common and ubiquitous of all minerals and is a major constituent of beach sands throughout the world. It is always black,and occurs as disseminated grains,huge beds,distinct crystals and compact masses,such as the material from Cornwall,Pennsylvania. Magnetite is one of the most important ores of iron. It is attracted to a magnetic field,a characteristic property that allows it to be easily extracted from sands | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Arem, Joel |
Taille de l’image : | 3791 px × 2550 px |
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