Quartz occurs as prismatic crystals around 1 to 2 inches long and occasionally longer. Scepters are common in some cavities, and tabular Japan law twins occur in others. Pyrite is most often as sharp striated cubes, and pyritohedrons also occur. Amethyst is common in the upper part of the breccia where mining operations are currently being conducted. Most of the pyrite is found around the base of quartz crystals, but sometimes are perched on the tops of quartz.
Crystals are commonly up to an inch across, and sometimes to several inches.
Calcite and ankerite form small crystals on quartz and may be abundant in a cavity. Barite is uncommon, but some spectacular tabular crystals have been found. Washington Pass, Okanogan County Quicktime movies of this locality are available for download. This locality is an unusual locality along Highway 20 in the northern Cascade Mountains. Highway 20 is the northern most cross state highway.