Travertine Speleothem Cross Section rockinaboxgeo They are enclosed inside acrylic

They are enclosed inside acrylic specimen jars and housed inside our classic

91g Campo Del Cielo meteorite from Argentina

As with the pendant necklace

7 million square mile basin (7 million square km) is home to the Amazon rainforest

A small information card is also included that also serves as the certificate of authenticity

Travertine Speleothem Cross Section rockinaboxgeo They are enclosed inside acrylicMillions of years of formation This specimen is a travertine speleothem cross section. Like the rings of a tree, the circular pattern shows the growth of the limestone over the course of millions of years. Humans have always been fascinated by its beauty, with many classical buildings like the Colosseum being built from travertine. Travertine forms as calcium carbonate rich water flows through a cave or hot spring. Little by little, it leaves behind