Datolite

specimen number:
1791259

location:
Nassau Mine, Ontonagon Co., Michigan, USA

description:
A cut and polished attractive datolite nodule half.

The Nassau Mine, historically also known as the Flintsteel Mine or Superior-Nassau Mine, is located near Mass City in Ontonagon County, Michigan. Geologically, it sits within the famous Michigan Copper Country, where native copper and associated minerals like quartz, calcite, and epidote occur within Precambrian Keweenawan-series basaltic lava flows and interbedded sedimentary rocks. Historically, the site was part of the mid-19th and early 20th-century regional copper rushes, seeing speculative and small-scale exploratory mining efforts aimed at extracting native copper from local fissure veins and amygdaloidal lodes.

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