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Gem and mineral site

Tsumeb

Dioptase, azurite, many rare species
Tsumeb
Volly247 · CC BY-SA 4.0 · source

One of the greatest mineral localities in the history of the world. The Tsumeb mine in Namibia, worked for copper and lead, produced the most beautiful specimens ever found of dozens of species, blazing green dioptase, deep-blue azurite, and rare minerals in a variety and quality unmatched anywhere, over 300 species in all. The mine is closed and flooded, but Tsumeb material is the crown of every great mineral collection on Earth. A place of pilgrimage in name if not in access.

What comes out of it

Dioptase, azurite, many rare species

Where it is

Namibia
See it on the map

The source

https://en.wikipedia.org/wiki/Tsumeb

Nearby

This is remote ground. The closest other places on the map are a long way off.