First published use of name. Intent to name and designation of a type not stated. Has the texture of a granite porphyry. Composed of small gray feldspar phenocrysts embedded in a finely granular aggregate of hypidiomorphic, quartz, smaller feldspars, biotite, minute grains of fluorite, and microscopic zircon, magnetite, hematite, and micropegmatitic intergrowths of quartz and feldspar. Fresh color is purple. Weathered color is gray and brown. Quartz is abundant. The feldspar is microcline. Microcline also composes much of the groundmass. Biotite occurs in flakes. The more characteristic mineral is fluorite. Confined to a small area at the Summit and west slope of Pikes Peak in El Paso Co, CO in the Southern Rocky Mountain region. Small geologic map.

Source: GNU records (USGS DDS-6; Denver GNULEX).