Uruguay Sodalite Rough Chunk! Mexican Agate but the most accepted theory

but the most accepted theory is that they are coprolites and intestinal casts from Predatory Sea Worms

if your goal is slabs

and can be a picture jasper when cut right

as the obsidian between is often pure and almost completely see through when held to light or cut thin enough

and one of the kings of Jasper

Uruguay Sodalite Rough Chunk! Mexican Agate but the most accepted theoryUruguay Sodalite is known for having much deeper blue than most any other type of Sodalite! Sodalite is a well renowned blue tectosilicate lapidary material! It gets its name due to its high sodium content. It tends to work into great cabochons, and takes a great polish. It has historically been mistaken for Lapis Lazuli, due to the bright blue contrast both stones can have. Weight: Approx 9 lbs 1. 2 oz Measurements (inches longest approx): 8. 9 x 8.