Access is via a long, scenic drive up a rough forest road, then a very steep hike up a rocky route through the forest. Collecting is allowed on a fee basis only. Collecting trips must be arranged in advance, and only a few trips are allowed each summer. The locality is a pipe-shaped breccia body in granodiorite of the Snoqualmie batholith. 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.