Stillwater

Stillwater is the county seat of Washington County, Minnesota, on the St. Croix River. It has real quarrying history — two 19th-century building-stone quarries, the South Hill (Staples) Quarry and the North Hill (Carli) Quarry, supplied stone for local foundations, streets, and the state prison wall [1]. What this research could not confirm is any connection between Stillwater and tripoli, the specimen this listing lists. Tripoli — a microcrystalline silica material used as an abrasive and polishing medium — is a documented commodity in Arkansas, Oklahoma, Missouri, and Illinois [2], and no source found ties tripoli deposits or production to Minnesota specifically; one Minnesota Geological Survey document mentions tripoli only as an imported material used in Minnesota grinding/milling operations, not as a Minnesota-sourced mineral [2]. This looks like a mismatch between the listed specimen and the actual local geology — flagged for the Board to check against the source database.

Stillwater sits on the St. Croix River in Washington County, Minnesota, along MN-95/MN-36. The historic South Hill and North Hill quarry sites were within the town itself [1]; exact current parcel status for either is UNVERIFIED.

Not established. Given the tripoli specimen mismatch and lack of a confirmed current quarry or outcrop, no collecting method can be honestly recommended for this listing as-is.

Land status is UNVERIFIED. The historic Staples and Carli quarries date to the late 1850s–1890s and their current ownership/status wasn't confirmed in this research [1]. Given the specimen-list concern above, this page needs a source-data check before it's treated as a reliable collecting reference.