Inclusions

by Joe Zink May. 12, 2018 484 views
Septarian concretion

Septarian concretion

Copper vein inside malachite

Copper vein inside malachite

At least the rocks are getting bigger...LOL...these are hand sized or larger.

The upper rock is a Sepatarian concretion. The word Concretion is from Latin, and means "grow together". Concretions are collections of minerals that come together when water carries them into seeps in some sedimentary rocks or soils. The minerals eventually harden into crystal habits.

The second rock is an absolutely wonderful specimen from the Keweenaw area of Upper Michigan. It contains very clear veins of pure copper within a rock body (malachite?) There is evidence that Native Americans mined copper in the Upper Peninsula of Michigan as early as 7,000 years ago. They would put rocks like this in a fire and then after they were heated up, pour cold water on them to crack the rock and extract the copper!

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Laurie Madsen 1 year, 8 months ago

Super!

1 year, 8 months ago Edited
Olga Helys 2 years, 4 months ago

Great colors, textures

2 years, 4 months ago Edited
Joe Zink Replied to Olga Helys 2 years, 4 months ago

Thanks, Olga!
A very difficult thing to photograph, it has a polished surface with rough or missing pieces in some places...just enough to fool you for where to focus grinning

2 years, 4 months ago Edited
Camellia Staab 2 years, 5 months ago

#1 is a beauty. Great shots and as always interesting narrative.

2 years, 5 months ago Edited
Joe Zink Replied to Camellia Staab 2 years, 5 months ago

Thanks, Camellia! Now that the weather's getting nicer , I hope to spend more time outside looking for cool rocks for next winter's photo ops grinning

2 years, 5 months ago Edited
Antonio Gil 2 years, 5 months ago

Another cool and informative post Joe. TFS

2 years, 5 months ago Edited
Joe Zink Replied to Antonio Gil 2 years, 5 months ago

grinning

2 years, 5 months ago Edited
Joe Zink 2 years, 5 months ago

Dangit, I forgot to add that comments and constructive criticism are welcome!

2 years, 5 months ago Edited
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