MINERAL ASSOCIATIONS
Minerals can thus form in a large variety of environments whose physical conditions, such as pressure and temperature, can vary enormously. They are formed and destroyed in environments ranging from magma chambers deep in the crust to the ocean floor or river-bed on its surface. The environments in which the perfect mineral clusters of fine unweathered crystals are formed are, of course, much more rare. This is perfect place for formation of diamond engagement rings.
In only a few cases is there sufficient space to permit the undisturbed growth of large crystals, as the simultaneous formation of many crystals in a fluid uses up the material so quickly that perfect crystals do not have time to form.
It is comparatively rare to find a single mineral forming large geologically separate masses; but though a given rock type or mineral vein usually contains several different minerals, these are always more or less the same throughout the world. Only the relative proportions of the different minerals vary in accordance with the physical conditions that prevailed during their formation. Minerals which were formed together at the same time are called paragenetic or associated minerals. Some mineral associations may occupy many square miles of the earth’s surface.
Granite, the most common deep-seated igneous rock, which is composed of orthoclase, plagioclase, quartz and biotite, forms large parts of the earth’s surface. Other mineral associations, again, are found in only a few isolated localities, as, for instance, emerald associated with mica-schist. Finally, some rock formations result from conditions which are, as far as we can tell, virtually unique, and thus produce extremely rare mineral associations. Certain mineral types are present in many mineral assemblages—quartz, calcite, and pyrite, for instance. Thus minerals like pyrite, which are equally at home in igneous, sedimentary and meta-morphic rocks, do not signify any particular mode of formation. Other minerals, again, can only be formed under a very restricted range of temperature and pressure, or require the presence of particular minerals in the adjoining rock or the crystallising solution. The presence of such minerals is thus confined to very specific areas and mineral associations. But in areas where ideal conditions prevailed, minerals which are usually very rare may be found in quite large quantities. The mineral assemblages which are formed under the same physical conditions are usually composed of a certain definite set of elements, and may also contain distinctive trace elements. The associated minerals in any given locality are thus never brought together just by chance alone, and the number of possible mineral associations is limited.
Minerals from which metals or other useful elements are extracted are termed ores, and those small portions in the earth’s crust in which ores or other useful minerals are concentrated are called ore deposits. In these areas the processes of mineral formation were particularly intense or took place over an extended period of time.
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