Rocks and Minerals (Pocket Nature) by Monica Price;Kevin Walsh
By Monica Price;Kevin Walsh
Even if you're a committed rock fan or an up-and-coming geologist, study every little thing you want to recognize to quick and simply determine over 325 rocks and minerals typically present in the united kingdom and Europe. From acanthite to zoisite this can be your perfect in-the-field and on-the-move reference.
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Extra resources for Rocks and Minerals (Pocket Nature)
Sample text
1mm. ESSENTIAL COMPONENTS Carbon, organic material. ADDITIONAL COMPONENTS None. ORIGIN Accumulation of organic debris. SIMILAR ROCKS Other coals (above) are black, rather than brown, and contain less plant materials. S E D I M E N TA R Y R O C K S 41 Anthracite A high grade black and shiny coal, anthracite does not dirty the fingers and breaks with a conchoidal fracture. It has a higher carbon content than other coals, and so lights and burns at a higher temperature. Jet is a similar rock, hard and black, and with a conchoidal fracture, but with a brown streak.
ORIGIN Chemical precipitation of iron minerals and silica. SIMILAR ROCKS Chert (right) does not have hematiterich layer as much red-coloured banding. Laterite is formed in tropical and desert areas where heat plays a major role in the weathering process. LATERITE A hardened iron and aluminium-rich nodular soil, laterite is formed in tropical and desert climates. The nodules of laterite are red-brown or yellow, and contain grains of sand or hardened clay. In desert climates, it may have a shiny surface, polished by the wind.
CARBONATITES are often economically important, such as here at Phalaborwa copper mine, South Africa. magnetite carbonate mineral GRAIN SIZE Wide range. ESSENTIAL COMPONENTS Calcite and/or dolomite. ADDITIONAL COMPONENTS Magnetite, apatite, phlogopite, rare earth minerals. ORIGIN Crystallization of a carbonate magma derived from the Earth’s mantle. 32). Xenoliths Magma often incorporates fragments of the country rock through which it passes during intrusion. These often remain within the igneous rock that forms when the magma cools and solidifies, and are known as xenoliths.