them to features seen in hand-sized specimen, at outcrop, or in mapping.

Separation of components

Separation of the ingredients of a crushed rock powder to obtain pure samples for analysis is a common approach. It maybe performed with a powerful, adjustable-strength electromagnet. A weak magnetic field attracts magnetite, then haematite and other iron ores. Silicates that contain iron follow in definite order--biotite, enstatite, augite, hornblende, garnet, and similar ferro-magnesian minerals are successively abstracted. Finally,

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