magnetite - hand/display specimen of iron ore that is attracted to a magnet
Magnetite - chemical formula: Fe3O4
Magnetite is a common ore of iron. It can form as magmatic segregations in igneous bodies. At Iron Mountain, Utah, an intrusion penetrated the Homestake Limestone of the Carmel Formation roughly 20-22 million years ago, doming up the rocks above it and eventually solidifying to form a laccolith. As magnetite crystallized it dropped to the bottom of the magma chamber. These specimens were collected from Iron Mountain.
A magmatic segregation of this type resulted in the largest magnetite deposits in the world, at Kiruna and Gellivare, Sweden.
At Iron Mountain, subsequent reheating melted the magnetite and pushed it into fractures and joints above.
Magnetite also forms the black sands of beaches, is a constituent in many igneous rocks, and is commonly associated with rocks rich in iron and magnesium such as diorite, gabbro and peridotite. It is the only mineral strongly attracted to a magnet. According to Pliny, its name comes from the shepherd, Magnes, who noticed that the nails in his shoes and the iron ferrule of his staff adhered to the ground on Mount Ida, a neat fable.
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These specimens ship in a Regional Priority Mail box and can be combined in that box with other purchases. These are priced as hand specimens because of the additional shipping cost. They become economical when combined with other purchases.