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3.4" Blue Chalcedony Pseudomorph After Anhydrite - Peru

#119$#chalcedony #Peru #Pseudomorph #blue #png #transparent #geology #gemstones #crystal specimen #crystal

Dozens of razor-thin concentric bands in dove gray, dusty lavender, and warm cream wrap a small central druzy quartz pocket — the banding is exceptionally tight and even throughout. Clean flat cut, natural rind intact on the back. This one found a great collector. 🩶

#minerals #geology #rockhounding #sold specimen #banded agate #agate hunting #mineral art #pseudomorph #fine minerals

Natural Azurite pseudomorph, Kamenushinskoe Cu deposit, Salairsky mine, Guryevsky area, Kemerovo Oblast, Russia

Photo: @South_Siberian_Minerals

#minerals #crystals #azurite #gems #gemstones #pseudomorph #Russia

Pseudomorph Tube Agate

Like little memory chambers in the brain. It's a marvelous pattern.

My favorite rock out of my (tiny) rock collection is a malachite sample. I would commit many crimes for a chunk of azurite though! Do you have any samples of either?

Here is my best malachite!

This piece is a pseudomorph, or "false form," a mineral taking the shape of a different mineral!

It started out as a cluster of azurite crystals. Over time, the azurite turned into malachite! This is something that can happen to azurite which is exposed to the air over long periods of time. It's not very chemically stable, and it reacts with moisture in the air to become the much more stable malachite - which chemically speaking is pretty much the exact same mineral but with way more hydrogen molecules. The malachite replaced the azurite perfectly, even preserving the exact shape of its crystals! Isn't that cool?!

As for azurite, this big sparkly specimen is my best piece of that!