Malachite
Slater Mine, Eminence, Shannon County, Missouri, USA
The Slater Mine started operations in 1837 so it's possible that this piece is at least 100 years old. Malachite in general is not a mineral species that people associate with Missouri, and this piece is honestly good quality for what it is. This specimen hosts soft to medium green crystal aggregates of malachite measuring up to 1.1 cm on oxidized ...
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