Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #2: Pre-Cambrian Granites

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White pigmatites in hillside are caused by high amounts of silica and water being injected into the rock. The white is areas are quartz coves in the middle of the pigmatities.
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White pigmatites in hillside are caused by high amounts of silica and water being injected into the rock. The white is areas are quartz coves in the middle of the pigmatities.