Geology

Geology
The 366 daily episodes in 2014 were chronological snapshots of earth history, beginning with the Precambrian in January and on to the Cenozoic in December. You can find them all in the index in the right sidebar. In 2015, the daily episodes for each month were assembled into monthly packages (link in index at right), and a few new episodes were posted from 2015-18. You may be interested in a continuation of this blog on Substack at this location. Thanks for your interest!

Monday, March 23, 2015

Episode 370: Pseudomorphs



Malachite pseudomorph after cuprite showing octagon and dodecahedron faces.
From Chessy, France. Specimen is just over 1 cm in maximum dimension.
Photo by Richard I. Gibson.
Today for Mineral Monday my special guest is Kyle Eastman, mineral collector and geologist, here to discuss with me some special minerals called pseudomorphs. These are “false form” minerals that have the shape of one mineral but are actually something else because of replacement, substitution, encrustation, or some other process.

We discuss some classic pseudos from Chessy, France and Corocoro, Bolivia, as well as one of Kyle’s favorite skarns from Arizona.

Running time, 19 minutes.
—Richard I. Gibson

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