Inset figure is from Page 255 of EchoHawk and Kackstaetter. Image is from Google maps.
The 1 to 2 meter pegmatite dike cuts Precambrian gneises and schists. Within the dike you can see the sequence of crystallization along the discontinuous side of Bowen's reaction series along the fringes of the massive white quarts in the vein (see the image). Stop 2 of EchoHawk and Kackstaetter
References
Page 254 - EchoHawk, B. and Kackstaetter, U., 2016, Roadside faults, folds, fossils, crystals, and diamond pipes - Sampling the geologic diversity of northern Colorado: Geol. Soc. Am. Field Guide 44, p. 247-266.
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