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Only a representative minority of the hundreds of shonkinite, syenite, and carbonatite dikes are shown. Classification of ores related to alkaline rocks is also controversial.
Widespread andesitic and rhyolitic dikes, of Mesozoic or Tertiary age, are not shown. Table 2 presents a relatively simple classification that follows analogous categories for deposits related to nonalkaline igneous rocks.
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Unlike most commercially mined base and precious metals, however, rare earth elements are rarely concentrated into mineable ore deposits.Economic concentrations of REE-bearing minerals occur in some alkaline rocks, skarns and carbonate-replacement deposits associated with alkaline intrusions, veins and dikes cutting alkaline igneous complexes and surrounding rocks, and soils and other weathering products of alkaline rocks.REE Periodic Table: The Rare Earth Elements are the 15 lanthanide series elements, plus yttrium.You may now see our list and photos of women who are in your area and meet your preferences.Again, please keep their identity a secret Click on the "Continue" button search with your zip/postal code.
Scandium is found in most rare earth element deposits and is sometimes classified as a rare earth element. Weathering of all types of rocks yields sediments that are deposited in a wide variety of environments, such as streams and rivers, shorelines, alluvial fans, and deltas.