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The quartz and albite contain small dark inclusions of cassiterite and columbite-tantalite-group minerals.
The cassiterite occurs as pale brown, fine-grained vein fillings and is not of much interest to collectors as specimens.
The chief commodity sought is tin, as fine-grained cassiterite in vein swarms related to the emplacement of granitic rocks within sedimentary carbonates.
Several years ago a Colorado mineral dealer was alleged to have sold cassiterite fraudulently labeled as being from this area.
The discovery of a pocket of cassiterite here in 1915 created a small flurry of interest in tin; however, further exploration was unproductive.
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