1 left

geode - whopper unopened geode from Mexico - display specimen

$ 12.50

Geodes are bubble fillings that weather out of a vesicular lava. As the flow cools, unescaped gases form voids in the otherwise solid flow. Subsequent hydrothermal activity fills these voids with mineral-rich hot water and as it cools, crystals grow on the surface of the roughly spherical opening. In the lava flow, the immediate zone around the now crystal-lined bubble is altered, becomes more resistant than the surrounding rock and subsequently weathers out. Often they are completely mineral-filled. Some are hollow.

This excellent display specimen clearly illustrates the bubble-in-a-lava-flow story. We don't have locality data other than "Mexico."

 

 

Ships in a Regional Priority Mail box. There would be room in that box for other specimens at no increase in postage. Please request an invoice to avoid overpaying shipping, by clicking the "combine shipping" button in the cart.  Click > Shipping < for shipping rates. Use back button to return to this page.

Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.