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The Geologic Column

Richard I Gibson

Geology newsletter by Richard I. Gibson. Minerals, Tectonics, and "Other."

Platform
Substack
PricingOnly free issuesPublishesDaily
Issues111SubscribersRead richardigibson.substack.com

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Latest Issues

Recent posts by this newsletter. Browse the email archive.

Hidden hemimorphite

“Best” and “finest” are subjective judgements for most things, but it’s generally agreed that the finest hemimorphite crystals in the United States come from the Summit Mine (formerly called the Montana Silver Star Mine, not to be confused ...

a month ago
4
1

The Central African Copperbelt

The Zambian Copperbelt and Congo’s Katanga Belt comprise the Central African Copperbelt, one of the richest copper deposits in the world. It is unusual in comparison to other copper regions in being rich in cobalt, with probably half the wo...

a month ago
5
0

The Tetons

Middle Teton, 2006, taken during a Smithsonian Journey for which I was the Geological Study Leader. The dike is about 30 feet (9 meters) thick.

a month ago
16
15

Smithsonite

I like big, flashy, gemmy minerals as much as the next guy, but since I can’t afford them, I settle for things like this rock from Utah that cost me $3.50 last year.

a month ago
7
3

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Authors

The writers behind this newsletter.

  • Richard I Gibson

    I'm a geologist and historian living in Butte, Montana USA. Author of the History of the Earth Perpetual Calendar, What Things Are Made Of, and Butte Rocks.

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