Pegmatite vein outcrop
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