Quartz with Pyrite

specimen number:
1115309

location:
Middle Fork Snoqualmie River, King Co., Washington, USA

description:
A loose cluster of quartz crystals with minor pyrite. In good condition.

The Middle Fork of the Snoqualmie River valley, located in King County, Washington, is a rugged and heavily glaciated mountainous region within the Cascade Range. Geologically, the area is dominated by the Miocene Snoqualmie Batholith and older metamorphic and volcanic formations, where intrusive activity and hydrothermal fracturing created favorable pathways for metallic ore deposition and mineral-rich veins. Mineralogically, the region is famous for producing exceptional specimen material, particularly high-quality quartz crystals, amethyst scepters, Japan-law twins, and various associated sulfide minerals. Historically, Euro-American exploration and settlement began in the mid-to-late 19th century, leading to small-scale hard-rock mining claims targeting copper, gold, and silver, alongside intensive regional logging that lasted well into the twentieth century.

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