Which are the three important minerals found in these regions.
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The Rocky Mountains are a discontinuous chain of mountain ranges that extend from northern New Mexico northward into Alberta and British Columbia, Canada. In the Southwestern US, the Southern Rocky Mountains are a formally recognized physiographic division that contains the southernmost extension of these ranges, extending from New Mexico through Colorado and into the southern half of Wyoming. The Southern Rocky Mountains began to rise during the Laramide Orogeny (which peaked about 68 to 65 million years ago). The region is rich in minerals and mining lore, and continues to produce a variety of mineral resources (Figure 5.16). This was one of the earliest areas exploited for minerals during westward expansion across the US. Minerals, especially gold, were known to early Native Americans in this region, and later mined in small amounts by Spanish explorers—perhaps as early as the mid-16th century, and certainly in the 17th and 18th centuries.
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Since silicon (Si) and oxygen (O) are the most abundant elements in the crust by mass, it makes sense for silicates (e.g., feldspar, quartz, and garnet) to be some of the most common minerals in the Earth's crust and to also be found throughout the West.